A ----> Object code library
AAM --> Authorware shocked file
AAS --> Authorware shocked packet
ABF --> Adobe Binary Screen Font
ABK --> Corel Draw AutoBackup
ACE --> (i) Compression file format associated with a ACE-program called The Ace Archiver (binary)
ACL --> (i) Corel Draw 6 keyboard accelerator
ACL --> (i) Axialis Cursor Library
ACM --> Used by Windows in the system directory
ACP --> MicroSoft Office Assistant Preview file
ACR --> American College of Radiology file format
ACT --> (i) MicroSoft Office Assistant Actor file
ACT --> (i) Parson's Announcements file (binary)
ACV --> OS/2 drivers that compress and decompress audio data
AD ---> After Dark screensaver
ADA --> Ada source text (non-GNAT) (ASCII)
ADB --> Ada source text body (GNAT) (ASCII)
ADB --> Appointment database used by HP 100LX organizer
ADD --> OS/2 adapter drivers used in the boot process
ADF --> Amiga Disk File
ADI --> AutoCAD Device-Independent binary plotter format
ADM --> After Dark MultiModule screensaver
ADP --> (i) Used by FaxWorks to do setup for fax modem interaction
ADP --> (i) Astound Dynamite file
ADR --> After Dark Randomizer screensaver
ADS --> Ada source text specification (GNAT) (ASCII)
AFM --> Adobe font metrics
AF2 --> ABC Flowchart file
AF3 --> ABC Flowchart file
AI ---> Adobe Illustrator drawing
AIF --> (i) Audio Interchange File, a sound format used by
AIF --> (i) Silicon Graphics and Macintosh applications (binary)
AIFC -> Similar to AIF (compressed) (binary)
AIFF -> (i) Audio Interchange File, a sound format used by
AIFF -> (i) Silicon Graphics and Macintosh applications (binary)
AIFF -> (i) Similar to AIF (binary)
AIM --> AOL Instant Messenger Launch
AIS --> ACDSee Image Sequence file
AIS --> Velvet Studio Instruments
AKW --> (i) Contains all A-keywords in the RoboHELP Help
AKW --> (i) project Index Designer not associated with topics
ALAW -> European telephony format audio
ALB --> JASC Image Commander album
ALL --> Arts & Letters Library
AMS --> (i) Velvert Studio music module (MOD) file
AMS --> (i) Extreme's Tracker module format
ANC --> (i) Canon Computer Pattern Maker file that is
ANC --> (i) a selectable list of pattern colors
ANI --> Animated Cursor
ANS --> ANSI text (ASCII)
ANT --> saved game file in the original SimAnt for Windows
API --> Application Program Interface file; used by Adobe Acrobat
APR --> Lotus Approach 97 file
APS --> MicroSoft Visual C++ file
ARC --> LH ARC (old version) compressed archive (binary)
ARI --> Aristotle audio file
ARJ --> Robert Jung ARJ compressed archive (binary)
ART --> (i) Xara Studio drawing
ART --> (i) Canon Crayola art file (binary)
ART --> (i) Clip Art file format
ART --> (i) Another Ray Tracer format
ART --> (i) Used by AOL to designate files compressed using
ART --> (i) the Johson-Grace compression algorithm (binary)
ASA --> MicroSoft Visual InterDev file
ASC --> (i) ASCII text (ASCII)
ASC --> (i) PGP armored encrypted file
ASD --> WinWord AutoSave
ASE --> Velvet Studio sample
ASF --> MicroSoft Advanced Streaming Format file
ASM --> Assembler language source file
ASO --> Astound Dynamite Objects
ASP --> (i) Active Server Page (an HTML file containing a MicroSoft
ASP --> (i) server-processed script) (ASCII)
ASP --> (i) Procomm Plus setup and connection script (ASCII)
ASP --> (i) Astound Presentation file
AST --> (i) Astound multimedia file
AST --> (i) Claris Works "assistant" file
ASV --> DataCAD Autosave file
ASX --> (i) Cheyenne Backup script (ASCII)
ASX --> (i) MicroSoft Advanced Streaming Redirector file
ASX --> (i) Video file
ATT --> AT&T Group 4 bitmap (binary)
AU ---> (i) Sun/NeXT/DEC/(UNIX) sound file
AU ---> (i) Audio U-law (pronounced mu-law) file format
AVB --> Inculan Anti-Virus virus infected file
AVI --> MicroSoft Audio Video Interleaved file format for Windows movie
AVR --> Audio Visual Research file format
AVS --> Application Visualization System format
AWD --> Fax Viewer document
AWK --> (FROM AUTOSPELL no identification)
AWR --> Telsis file extension format for digitally stored audio.
AXX --> (i) ARJ compressed files from a multi-volume archive
AXX --> (i) (XX = a number from 01 to 99) (binary)
A3M --> unpackaged Authorware MacIntosh file
A4M --> unpackaged Authorware MacIntosh file
A4P --> Authorware file packaged without runtime
A3W --> unpackaged Authorware windows file
A4W --> unpackaged Authorware windows file
A5W --> unpackaged Authorware windows file

BAK --> Backup file
BAS --> BASIC code (ASCII)
BAT --> Batch file (ASCII)
BBX --> Boom Box for Windows
BCM --> MicroSoft Works 4.0 Communication
BDB --> MicroSoft Works 4.0 database
BDF --> West Point Bridge Designer program
BFC --> Windows 95 Briefcase document
BFX --> BitFax Pro ViewFax
BG ---> Backgammon for Windows game
BGL --> (i) from MicroSoft concerning scenery files from the
BGL --> (i) well known Flight Simulator
BI ---> Binary file (binary)
BID --> Parson's Announcements file (binary)
BIF --> GroupWise initialization file
BIFF -> XLITE 3D file format
BIG --> Text file created from other text files (ASCII) (tgs)
BIN --> Binary file (binary)
BIT --> ASCII text file, part of larger file(s) (tgs) (ASCII)
BK ---> Sometimes used to denote backup versions
BK$ --> Sometimes used to denote backup versions
BKS --> (i) An IBM BookManager Read bookshelf
BKS --> (i) MicroSoft Works 4.0 Sheet or Chart
BKX --> Backup file where X = 1 to 9 (tgs)
BMK --> A bookmark file (ASCII)
BMK --> CNM Bookmark Collection (content type MIME)
BMP --> Windows or OS/2 bitmap (binary)
BM1 --> Apogee BioMenace data file (binary)
BNK --> processed ASCII file (tgs)
BOOK -> Adobe FrameMaker Book
BOX --> A mailbox in Notes
BPL --> Borland Delphi 4 packed library (binary)
BQY --> BrioQuery file
BPS --> MicroSoft Works 4.0 Document
BRX --> A file for browsing an index of multimedia options
BSC --> MS Developer Studio (MSDev) browser information file
BSP --> Quake map
BS1 --> Apogee Blake Stone data file
BS_ --> MicroSoft Bookshelf Find Menu shell extension
BTN --> Parson's Announcements file (binary)
BTM --> Batch file used by Norton Utilities
BUD --> Backup disk for Quicken
BUN --> CakeWalk Audio Bundle file (a MIDI program)
BW ---> SGI Black and White image file
BYU --> A file in a Movie BYU format
B4 ---> Helix Nuts and Bolts file

C ----> C code (source file)
C01 --> Typhoon wave files
CAB --> (i) MicroSoft cabinet file (program files compressed
CAB --> (i) for software distribution) (binary)
CAD --> Used by the drafting program "Drafix Cad" by Softdesk
CAL --> (i) CALS Compressed Bitmap (binary)
CAL --> (i) Calendar schedule data
CAM --> Casio camera format
CAP --> Compressed music file format (binary)
CAR --> Announcements document file (card)
CAS --> Comma-delimited ASCII file
CAT --> IntelliCharge categorization file used by Quicken
CB ---> MicroSoft clean boot file
CBI --> Column binary formatted file (used in IBM mainframe systems)
CCA --> cc:mail
CCB --> Visual Basic Animated Button configuration
CCF --> Multimedia Viewer configuration file used in OS/2
CCH --> Corel Chart
CCM --> Lotus CC:Mail "box" (for example, INBOX.CCM)
CCO --> CyberChat data file
CCT --> Macromedia Director Shockwave cast
CDA --> CD Audio Track
CDB --> CardBase Document
CDF --> (i) MicroSoft Channel Definition Format file
CDF --> (i) Document (Content type MIME)
CDI --> Phillips Compact Disk Interactive format
CDP --> ColorDesk image
CDR --> CorelDraw drawing (graphics) (binary)(
CDR --> Raw Audio-CD data
CDT --> Corel Draw template
CDX --> (i) Corel Draw compressed drawing (binary)
CDX --> (i) MicroSoft’s Visual Foxpro Index
CDX --> (i) CardBase import/export file
CEL --> CIMFast Event Language file
CER --> Certificate file (MIME x-x509-ca-cert)
CFB --> Compton's Multimedia file
CFG --> Configuration file
CFM --> Cold Fusion template files
CGI --> Common Gateway Interface script file (ASCII)
CGM --> Computer Graphics Metafile (binary)
CH ---> OS/2 configuration file
CHK --> File fragments saved by Windows Disk Defragmenter or ScanDisk
CHM --> Compiled HTML file
CHR --> Character Sets (Font files)
CHP --> Ventura Publisher chapter
CHT --> (i) ChartViewer file
CHT --> (i) Harvard Graphics vector file (binary)
CIL --> Clip Gallery download package
CIM --> Sim City 200 file
CIN --> OS/2 change control file that tracks changes to an INI file
CK# --> iD/Apogee Commander Keen # (where # is a number) data file
CLASS > Java class
CLL --> Crick Software Clicker File
CLP --> Windows Clipboard file ?????
CLS --> Visual Basic Class Module
CMD --> (i) Command file for Windows NT (similar to a DOS .BAT file), OS/2
CMD --> (i) DOS CP/M command file
CMD --> (i) dBase-II program file
CMF --> Corel Metafile
CMP --> (i) JPEG Bitmap (binary)
CMP --> (i) Address document
CMV --> Corel Move animation
CMX --> Corel Presentation Exchange image
CNF --> (i) Configuration file used by Telnet, Windows,
CNF --> (i) and other applications with varying internal formats
CNM --> Windows application menu options and setup file
CNQ --> Compuworks Design Shop file
CNT --> (i) Windows (or other) system content files for the
CNT --> (i) help index and other purposes
COB --> trueSpace2 object
COD --> (i)MicroSoft C compiler output as displayable machine
COD --> (i) language/assembler with original C as comments
COM --> Command file (binary) (Executable)
CPD --> (i) Corel PrintOffice file (drawing)
CPD --> (i) Fax Cover document
CPE --> Fax Cover document
CPI --> MicroSoft MS-DOS code page information file
CPL --> (i) Control Panel extension
CPL --> (i) Corel color palette
CPO --> Corel Print House file
CPP --> C++ code
CPR --> Corel Presents Presentation
CPT --> Corel Photo-Paint image
CPT --> EconoWatch Document
CPX --> Corel Presentation Exchange Compressed drawing (binary)
CR1 --> EconoWatch Document
CRD --> Cardfile file
CRP --> Corel Presents Run-Time Presentation
CRT --> Internet Security Certificate
CSC --> Corel Script (ASCII)
CSP --> PC Emcee On-Screen image
CSS --> Cascading Style Sheet file (MIME)
CST --> Macromedia Director "Cast" (resource) file
CSV --> Comma-separated values file
CT ---> Scitex CT Bitmap (binary)
CT ---> (i) A graphic file associated with the Paint Shop Pro Graphic
CT ---> (i) Editor Used in general to mean a file containing
CT ---> (i) control information.
CTL --> (i) FAXWorks uses it to keep information about each
CTL --> (i) fax sent and received.
CTL --> Control data file (tgs)
CTR --> Comm Term Document (Content type MIME)
CUE --> MicroSoft Cue Cards data
CUR --> Windows Cursor
CUT --> Dr Halo bitmap (graphics) (binary)
CV ---> Corel Versions archive (binary)
CV ---> MicroSoft CodeView information screen
CWK --> Claris Works data file
CWS --> Claris Works template
CXT --> (i) Macromedia Director protected (not editable)
CXT --> (i) "Cast" (resource) file
CXX --> C++ source code file

DAT --> Data file, "catchall" file, (ASCII/Binary)
DAT --> WordPerfect Merge Data
DAT --> Extension used for some MPEG formats
DB ---> Borderland's Paradox 7 tables
DBC --> MicroSoft's Visual Foxpro Database container
DBF --> Aston-Tate dBASE database
DBX --> DataBeam image
DBX --> MicroSoft's Visual Foxpro Table
DCM --> DCM model format
DCR --> Shockwave file
DCR --> Macromedia Director Protected Movie (non-editable)
DCS --> Desktop Color Separation file
DCT --> MicroSoft’s Visual Foxpro Database container
DCU --> Delphi compiled unit file
DCX --> MicroSoft’s Visual Foxpro Database container
DCX --> Fax image (based on PCX) (binary)
DCX --> Macros
DC5 --> DataCAD Drawing files
DDF --> BTRIEVE database
DDIF -> (i) Digital Equipment or Compaq format. Used for storing
DDIF -> (i) images and their word processing documents
DEF --> (i) SmartWare II data file
DEF --> (i) C++ Definition
DEFI -> Oracle 7 de-install script (ASCII)
DEM --> USGS standards for Digital Elevation Models
DEL --> Has to do with graphics files, eg, BMP files
DER --> Internet Security Certificate
DEWF -> Macintosh SoundCap/SoundEdit recorded instrument format
DGN --> Microstation95 CAD drawing file
DIB --> Device-Independent Bitmap (graphics) (binary)
DIC --> Dictionary
DIF --> Data Interchange Format spreadsheet
DIG --> (i) Digilink format
DIG --> (i) Sound Designer I audio file
DIR --> (i) Macromedia Director movie
DIR --> (i) Directory text file (tgs) (ASCII)
DIZ --> Description file (text file, shareware)(ASCII)
DLG --> C++ Dialogue Script (ASCII)
DLS --> DownLoadable Sound
DLL --> Dynamic-Link Library (binary)
DMF --> X-Trakker music module (MOD) file
DOC --> (i) FrameMaker or FrameBuilder document
DOC --> (i) WordStar document
DOC --> (i) WordPerfect document
DOC --> (i) MS Word document
DOC --> (i)DisplayWrite document
DOT --> MicroSoft Word document Template
DOT --> Kildekode til dot eller neato
DPL --> Borland Delphi 3 packed library
DPR --> Borland Delphi project header file
DRAW -> Acorn's object-based vector image file
DRV --> Driver file (binary)
DRW --> Micrografx Designer/Draw (binary)
DSF --> Micrografx Designer v7.x
DSG --> DooM saved game
DSM --> Dynamic Studio music module (MOD) file
DSP --> MicroSoft Developer Studio project
DSQ --> Corel QUERY file
DST --> Embroidery machines graphics file (binary)
DSW --> MicroSoft Developer Studio workspace
DTD --> SGML Document Type Definition file
DTED -> Digital Terrain Elevation Data (geographic data format)
DTM --> DigiTrakker Module
DTF --> Symantec Q&A relational database data file
DUN --> MicroSoft Dial-up Networking Export file
DV ---> Digital video file (MIME)
DWD --> DiamondWare digitized file
DWG --> (i) Autocad Drawing files
DWG --> (i) AutoCAD drawing, or older Generic CADD drawing format
DXF --> (i) Autodesk Drawing Interchange (eXchange) format
DXF --> (i) a text representation of the binary DWG format (ASCII)
DXF --> (i) Data Exchange File
DXR --> Macromedia Director protected (not editable) movie file

EDA --> Ensoniq ASR disk image
EDE --> Ensoniq EPS disk image
EDD --> Element Definition Document (FrameMaker+SGML documents)
EDK --> Ensoniq KT disk image
EDQ --> Ensoniq SQ1/SQ2/KS32 disk image
EDS --> Ensoniq SQ80 disk image
EDV --> Ensoniq VFX-SD disk image
EFA --> Ensoniq ASR file
EFE --> Ensoniq EPS file
EFK --> Ensoniq KT file
EFQ --> Ensoniq SQ1/SQ2/KS32 file
EFS --> Ensoniq SQ80 file
EFV --> Ensoniq VFX-SD file
ELI --> Encarta Encyclopedia Article List
EMD --> ABT Extended MoDule
EMF --> Enhanced Windows Metafile
EML --> MicroSoft Outlook Express mail message (MIME RFC 822)
ENC --> Encore file
ENFF -> Neutral File Format extension
EPHTML> Enhanced Perl-parsed HTML
EPS --> Encapsulated PostScript image
ER1 --> ERWin file
ERM --> CNM EditingRoom Script
ERR --> (i) Stores the error messages that result when the
ERR --> (i) RoboHELP Help Compiler attempts to compile the
ERR --> (i) source files of a Help system
ERX --> ERWin file
EPS -> Encapsulated PostScript Files
ESPS -> ESPS audio files (binary)
EUI --> Ensoniq ESP family compacted disk image
EVY --> Envoy document
EWL --> MicroSoft Encarta document
EXC --> MicroSoft Word Exclusion Dictionary
EXE --> Executable file (program) (binary)
EYB --> Encarta Encyclopedia Yearbook File

F ----> FORTRAN file
F2R --> Farandoyle linear module format
F3R --> Farandoyle blocked linear module format
F77 --> FORTRAN 77 file
F90 --> FORTRAN 90 file
FAR --> Farandoyle Composer music module (MOD) file
FAV --> MicroSoft Outlook navigation bar
FAX --> FAX Type image
FBK --> Navison Financials Backup
FCD --> Virtual CDROM
FDB --> Navison Financials Database
FDF --> Adobe Acrobat Forms Document file
FEM --> CADRE Finite Element Mesh file
FFA --> MS fast find file
FFF --> GUS PnP bank file format
FFL --> MS fast find file
FFO --> MS fast find file
FFT --> Final Form Text (part of IBM's DCA) (ASCII)
FFX --> MS fast find file
FH3 --> Aldus Freehand 3 drawing
FIF --> Fractal image file
FIG --> A file format used by REND386/AVRIL
FIL --> ASCII text file (tgs) (ASCII)
FITS -> (i) CCD camera image
FITS -> (i) Flexible Image Transport System
FLA --> Macromedia Flash movie
FLC --> AutoDesk FLIC animation
FLF --> (i) Corel Paradox Derived form
FLF --> (i) Navison Financials License file
FLI --> AutoDesk FLIC animation
FLT --> Corel filter
FLT --> Parson's Announcements file (binary)
FLF --> An OS/2 driver file
FLT --> (i) StarTrekker music module (MOD) file
FLT --> (i) A file format use in MulitGen Inc.'s Open Flight
FLV --> Flash Video file by Macromedia
FM ---> Adobe FrameMaker Document
FMB --> Oracle binary source code for form, version 4.0 and later
FML --> File Mirror List (GetRight)
FMS --> FractMus document (Fractal Music)
FMT --> (i) Oracle text format of form, version 4.0 and later
FMT --> (i) MicroSoft Schedule+ print file
FMX --> Oracle executable form, version 4.0 and later
FND --> MicroSoft Explorer Saved Search file (Find applet)
FNG --> Font group file (Font Navigator)
FNK --> FunkTracker module format
FNT --> Bitmap font file (binary)
FOG --> Fontographer font
FON --> System font (Bitmap font file) (binary)
FOR --> FORTRAN file
FOT --> Font-related file
FP ---> FileMaker Pro file
FP1 --> Flying Pigs for Windows data file
FP3 --> FileMaker Pro file
FPT --> FileMaker Pro file
FPT --> MicroSoft FoxPro memo fields
FPX --> (i) FlashPix bitmap (binary)
FPX --> (i) MicroSoft Picture It! Picture
FRM --> (i) Form template (ASCII)
FRM --> (i) FrameMaker or FrameBuilder document
FRM --> (i) Oracle executable form version 3.0 and earlier
FRM --> (i) Visual Basic form
FRM --> (i) WordPerfect Merge form
FRM --> (i) Datacad Symbol Report file
FRX --> (i) Visual Basic form stash file
FRX --> (i) MicroSoft FoxPro report file
FRT --> MicroSoft FoxPro report file
FSF --> fPrint Audit Tool file format
FSL --> (i) Borderland's Paradox 7 forms
FSL --> (i) Corel Paradox Saved form
FSM --> Farandoyle Sample format
FT ---> (i) Lotus Notes Full Text index
FT ---> (i) Full-text Search Group file resulting from using
FT ---> (i) Find in the Windows Help system. Can be erased; regenerates
FTG --> (i) Full-text Search Group file resulting from using
FTG --> (i) Find in the Windows Help system. Can be erased; regenerates
FTS --> (i) Full-Text Search index file resulting from using
FTS --> (i) Find in the Windows help system
FW2 --> Framework II
FW3 --> Framework III file
FW4 --> Framework IV file
FXP --> MicroSoft FoxPro compiled source file
FZB --> Casio FZ-1 Bank dump
FZF --> Casio FZ-1 Full dump
FZV --> Casio FZ-1 Voice dump

G721 -> Raw CCITT G.721 $bit ADPCM format data
G723 -> Raw CCITT G.723 3 or 5bit ADPCM format data
GAL --> Corel Multimedia Manager album
GCD --> (i) Generic (TM) CADD drawing (later versions)
GCD --> (i) GLOBAL CD - File containing every single byte from a CD
GCP --> (i) Ground Control Point file used in image processing of remote
GCP --> (i) sensing data often to form map projections. CHIPS (CopenHagen
GCP --> (i) Image Processing System) uses these files.
GDB --> (i) InterBase database file
GDB --> (i) Parson's Announcements file (binary)
GDM --> Bells, whistles, and sound boards module format
GED --> (i) GEDCOM genealogical data file, a popular format for
GED --> (i) recording and exchanging genealogical data (ASCII)
GED --> (i) Graphic Environment Document (drawing)
GEM --> Ventura/GEM metafile (graphics file) (binary)
GEN --> Ventura-Generated text file (ASCII)
GetRight> GetRight Unfinished-Download file
GFC --> Patton&Patton Flowcharting 4 flowchart file
GFI --> Genigraphics Graphics Link presentation (binary)
GFX --> Genigraphics Graphics Link presentation (binary)
GID --> Windows 95 global index file (containing help status)
GIF --> CompuServe bitmap (binary)
GIM --> Genigraphics Graphics Link presentation (binary)
GIX --> Genigraphics Graphics Link presentation (binary)
GKH --> Ensoniq EPS family disk image file
GKS --> Gravis GripKey document
GL ---> An animation format
GNA --> Genigraphics Graphics Link presentation (binary)
GNT --> (i) Generated Code, an executable code in a
GNT --> (i) Micro Focus proprietary format
GNX --> Genigraphics Graphics Link presentation (binary)
GRA --> MicroSoft Graph 97 chart
GRD --> (i) Grid file, used in image processing of remote sensing
GRD --> (i) data often to form map projections. CHIPS (CopenHagen
GRD --> (i) Image Processing System) uses these files
GRF --> Grapher (Golden Software) graph file
GRP --> Program Manager Group
GSM --> (i) Raw GSM 6.10 audio stream
GSM --> (i) Raw 'byte aligned' GSM 6.10 audio stream
GSM --> (i) US Robotics voice modems GSM w.o. header/VoiceGuide/RapidComm
GSM --> (i) US Robotics voice modems GSM w. header/QuickLink
GTK --> Graoumftracker (old) music module (MOD) file
GT2 --> Graoumftracker (new) music module (MOD) file
GWD --> Parson's Announcements file (ASCII_)
GWP --> Greetings Workshop Project file
GWX --> Genigraphics Graphics Link presentation (binary)
GWZ --> Genigraphics Graphics Link presentation (binary)
GZ ---> (UNIX) Gzip compressed file (binary)

H ----> C program header
HCOM -> Sound Tools HCOM format
HDF --> A file in Hierarchical Data Format
HED --> HighEdit document
HEL --> MicroSoft Hellbender saved game
HEX --> Macintosh BinHex 2.0 file
HGL --> HP Graphics Language drawing (binary)
HH ---> (i) Map file. Contains topic IDs and map numbers for each
HH ---> (i) of the topics in a Help system. Allows the running
HH ---> (i) application to send the user the appropriate
HH ---> (i) context-sensitive help topic
HLP --> (i) Help file
HLP --> (i) DataCAD Windows Help file
HOG --> Lucas Arts Dark Forces WAD file
HPJ --> Visual Basic Help Project
HPP --> C++ program header
HQX --> Macintosh BinHex 4.0 file
HST --> History file
HT ---> HyperTerminal datafile (binary)
HTM --> HyperText Markup Language document (ASCII)
HTML -> HyperText Markup Language document (ASCII)
HTT --> MicroSoft Hypertext Template (ASCII)
HTX --> Extended HTML template (ASCII)
HXM --> Descent2 HAM file extension

IBM --> Data files for "Grandma and Me"
ICA --> Citrix WinFrame file
ICB --> Targa bitmap (binary)
ICC --> Kodak printer format
ICL --> Icon Library file (industry standard)
ICM --> Image Color Matching profile file
ICO --> Windows Icon
IDB --> MSDev 'intermediate' file
IDD --> MIDI Instrument Definition
IDF --> MIDI Instrument Definition (Win95 required file)
IDQ --> Internet Data Query file
IDX --> (i) MicroSoft FoxPro relational database index file
IDX --> (i) Symantec Q&A relational database index file
IDX --> (i) MicroSoft Outlook Express file
IFF --> Interchange Format Files, Amiga ILBM (graphics) (binary)
IGES -> Initial Graphics Exchange Specification file (binary)
IGF --> Inset Systems metafile
IIF --> QuickBooks for Windows interchange file
ILBM -> A bitmap (graphic image) file (binary)
IMA --> WinImage file (binary)
IMG --> GEM image (binary)
IN ---> Copy of IN.MBX (Eudora inbound mail box)
INC --> Assembler language or Active Server include file
INF --> Information file (ASCII)
INI --> Initialization file (ASCII)
INI --> MWave DSP synth's mwsynth.ini GM-setup
INI --> Gravis UltraSound bank setup
INP --> Oracle source code for form, version 3.0 and earlier
INRS -> INRS-Telecommunications audio
INS --> InstallShield install script (ASCII)
INS --> Internet Communications setting
INS --> X-Internet sign-up file
INS --> Ensoniq EPS family instrument
INS --> Sample Cell/II MAC/PC instruments
INT --> (i) Intermediate Code, an executable code produced when
INT --> (i) a source program is syntax-checked
IOF --> Findit document
IQY --> MicroSoft Internet Inquiry file
ISO --> (i) Lists the files on a CD-ROM; based on the ISO 9660
ISO --> (i) CD-ROM file system standard
ISO --> International Organization for Standardization file ISO 9660- optical disc
ISP --> Internet Communication setting
ISP --> X-Internet sign-up file
IST --> Digitaltracker instrument file
ISU --> InstallShield uninstall script (ASCII)
IT ---> Impulse Tracker music module (MOD) file
ITI --> Impulse Tracker instrument
ITS --> Impulse Tracker sample
ITS --> Internet document set (possibly a MicroSoft file)
IV ---> A file format use in Open Inventor
IW ---> Idlewild screensave

J62 --> Ricoh camera format
JAR --> (i) Java ARchive file (a compressed file for applets
JAR --> (i) and related files) (binary)
JAVA -> Java source code
JBF --> Paint Shop Pro image browser file (can delete, is rebuilt)
JFF --> JPEG file (graphics file) (binary)
JIF --> JPEG file (graphics file) (binary)
JFIF -> JPEG file (graphics file) (binary)
JMP --> SAS JMPDiscovery chart-to-statistics file
JN1 --> Epic MegaGames Jill of the Jungle data file
JPE --> JPEG file (binary)
JPEG -> JPEG compressed bitmap (binary)
JPG --> JPEG bitmap (graphics) (binary)
JS ---> JavaScript source code (ASCII)
JSP --> A HTML page containing a reference to a Java servlet (ASCII)
JTF --> JPEG bitmap (binary)

K25 --> Kurzweil 2500 sample
KAR --> Karaoke MIDI file (text+MIDI)
KDC --> Kodak Photo-Enhancer
KEY --> DataCAD Icon toolbar file
KFX --> KoFax Group 4 image (binary)
KIZ --> Kodak digital postcard files
KKW --> (i)Contains all K-keywords in the RoboHELP Help project
KKW --> (i)Index Designer not associated with topics
KMP --> Korg Trinity KeyMaP file
KQP --> Konica camera native files (binary)
KR1 --> Kurzweil 2000 sample (multi-floppy)
KRZ --> Kurzweil 2000 sample
KSF --> Korg Trinity Sample File
KYE --> Kye game data

LBM --> Deluxe Paint bitmap (graphics) (binary)
LBT --> MicroSoft FoxPro labels
LBX --> MicroSoft FoxPro labels
LCF --> Folio License Collection file
LCS --> Folio License Update Script
LDB --> MicroSoft Access lock file
LDL --> Corel Paradox Delivered library
LEG --> Legacy document
LES --> Logitech Entertainment system game profiles (same as REG file)
LFT --> 3D Studio (DOS) loft file
LHA --> Alternate file suffix for LZH
LIB --> Library
LIC --> ASCII license information file (tgs)
LIN --> DataCAD Line type file
LIS --> Output file from Structured Query Reporting (SQR) program
LLX --> Laplink Exchange Agent
LNK --> Windows shortcut file
LOG --> Log file (ASCII)
LPD --> Helix Nuts and Bolts file
LQT --> Liquid Audio File (binary)
LRC --> Intel Video Phone file
LSL --> Corel Paradox Saved library
LSP --> AutoLISP, CommonLISP, and other LISP language files
LST --> List file (ASCII)
LU ---> ThoughtWing Library Unit file
LVL --> Parallax Software's Miner Descent/D2 Level Extension
LWLO -> Lightwave Layered Object file
LWOB -> Lightwave Object file
LWP --> Lotus Wordpro 96/97 file
LWSC -> Lightwave Scene file
LYR --> DataCAD Layer file
LZH --> LH ARC compressed archive (binary)
LZS --> Skyroads data file

M1V --> MPEG-related file (MIME type 'mpeg')
M3D --> Corel Motion 3D animation (binary)
M3U --> MPEG URL (MIME audio file) audio/x-mpegurl
MAT --> Matlab variables file (binary)
MAC --> MacPaint image file (binary)
MAD --> MicroSoft Access module
MAF --> MicroSoft Access Form
MAG --> A graphics file format found in some Japanese files (binary)
MAGIC > Magic Mail Monitor configuration file
MAK --> Visual Basic or MS Visual C++ Project
MAM --> MicroSoft Access Macro
MAN --> (UNIX) Manual page output
MAP --> Map file
MAP --> Duke Nukem 3D WAD game file (binary)
MAQ --> MicroSoft Access Query
MAR --> MicroSoft Access Report
MAS --> (i) Master Dictionary file PCWrite
MAS --> (i) Lotus Freelance Graphics Smartmaster file (binary)
MAT --> MicroSoft Access Table
MAUD -> MAUD Sample format
MAX --> (i) A file format which represents a scene in
MAX --> (i) KINETIX's 3D Studio MAX
MAX --> Paperport file
MAX --> OrCAD layout file
MAZ --> Hover maze data
MAZ --> A file format use by Division's dVS/dVISE
MB1 --> Apogee Monster Bash data file
MBOX -> Berkeley (UNIX) mailbox format
MBX --> Extension MicroSoft Outlook adds to saved email
MBX --> Eudora mailboxes (ASCII)
MCC --> Dialer10 calling card
MCR --> DataCAD Keyboard macro file
MCW --> MicroSoft Word for Macintosh document
MDA --> MicroSoft Access add-in
MDA --> MicroSoft Access workgroup for version 2
MDB --> MicroSoft Access database
MDE --> MicroSoft Access MDE file
MDL --> Digital Tracker music module (MOD) file
MDL --> Quake model file
MDN --> MicroSoft Access blank database template
MDW --> MicroSoft Access Workgroup
MDZ --> MicroSoft Access wizard template
MED --> Music Editor, OctaMED music module (MOD) file
MER --> (i) Format for interchanging spreadsheet/database
MER --> (i) data; recognized by Filemaker, Excel, and others
MES --> aab Music Files
MET --> Presentation Manager metafile
MGF --> A file in a Materials and Geometry Format
MHTM -> MHTML document (MIME)
MHTML > MHTML document (MIME)
MI ---> Miscellaneous
MIC --> MicroSoft Image Composer file
MID --> MIDI music (binary)
MIDI -> MIDI music (binary)
MIF --> Adobe FrameMaker Interchange Format
MIFF -> (i) Machine Independent Format File. A multipart file
MIFF -> (i) in the Multi-Purpose Internet Mail Extensions (MIME)
MIFF -> (i) format; often created as the result of sending e-mail
MIFF -> (i) with attachments in AOL
MIM --> (i) The files in a multipart MIM file can be "opened"
MIM --> (i) (unarchived and separated into individual files)
MIM --> (i) using Winzip or a similar program. (binary)
MIME -> See MIM
MIX --> MicroSoft Picture It! Picture
MKA --> Matroska Audio file. Multimedia container format.
MKV --> Matroska Video file. Multimedia container format.
MLI --> A file in 3D Studio's Material-Library format
MLI --> Encarta Encyclopedia Media List
MME --> (i) A multipart file in the Multi-Purpose Internet Mail Extensions
MME --> (i) (MIME) format; often created as the result of sending e-mail with
MME --> (i) attachments in AOL. The files in a multipart MME file can be
MME --> (i) "opened" (unarchived and separated into individual files) using
MME --> (i) Winzip or a similar program. (binary)
MMF --> Meal Master Format, a recipe cataloging format
MMF --> MicroSoft Mail File
MMM --> MicroSoft Multimedia Movie
MMP --> Mindmapor MindManager file (binary)
MMO --> Audioactive file (audio/x-mpg)
MN2 --> Descent2 Mission File
MNI --> Mandelbrot for Windows
MNG --> Multi-image Network Graphics (binary)
MNT --> MicroSoft FoxPro menus
MNX --> MicroSoft FoxPro menus
MOD --> FastTracker, StarTrekker, Noise Tracker (etc.) music module file
MOD --> MicroSoft Multiplan spreadsheet
MOD --> Amiga/PC tracker module
MOD --> generic text/program module file (tgs) (ASCII)
MOD --> Eudora 3.0.6 script file
MOV --> QuickTime for Windows movie
MP2 --> MPEG Audio Layer 2
MP3 --> MPEG Audio Layer 3 (AC3)
MPA --> MPEG-related file (MIME type 'mpeg')
MPE --> MPEG animation
MPEG -> MPEG animation
MPG --> MPEG animation
MPP --> MicroSoft Project file
MPP --> CAD drawing file format
MPR --> MicroSoft FoxPro menus (compiled)
MP2 --> MPEG Audio Layer 2 file (MIME video file)
MP3 --> MPEG Audio Layer 3 (AC3) file
MP4 --> MPEG-4 Part 14. ISO - Multimedia Container format
MRI --> MRI Scan (Magnetic Resonance Imaging)
MSA --> Magic Shadow Archive (binary)
MSDL -> Manchesters Scene Description Language
MSG --> MicroSoft Mail message or message file of some kind
MSN --> (i)MicroSoft Network document
MSN --> (i)Descent Mission File
MSP --> MicroSoft Paint bitmap (binary)
MTM --> MultiTracker music module (MOD) file
MUL --> Online game called Ultima online
MUS --> Music (ASCII)
MUS10 > Mus10 audio
MVB --> MicroSoft Multimedia Viewer file
MWP --> Lotus Wordpro 97 Smartmaster file

NAN --> Nanoscope files (Raw Grayscale)
NAP --> NAP Metafile Vector image
netCDF> Network Common Data Form
NCB --> MicroSoft Developer Studio file
NCD --> Norton Change Directory
NCF --> Netware Command File
NCF --> Lotus Notes internal clipboard
NDO --> 3D low-polygon modeler, Nendo
NDX --> ASCII index file (tgs)
NFF --> Neutral File Format
NFL --> Folio Infobase link
NFO --> Folio Infobase
NFO --> ASCII information file (tgs)
NIL --> Norton Icon Library file (EasyIcons-compatible)
NIST -> NIST Sphere audio
NLB --> Oracle 7 data
NLM --> Netware Loadable Module
NLU --> Norton Live Update E-Mail Trigger file
NSF --> Lotus Notes database
NS2 --> Lotus Notes database (version 2)
NST --> Noise Tracker music module (MOD) file
NTF --> Lotus Notes database template
NWC --> Noteworthy Composer song file
NWS --> MicroSoft Outlook Express news message (MIME RFC822)

O01 --> Typhoon voice file
OBD --> MicroSoft Office binder template
OBD --> MicroSoft Office Binder
OBJ --> Object file
OBZ --> MicroSoft Office Binder Wizard
OCX --> MicroSoft Object Linking and Embedding custom control
ODL --> UNKNOWN (from Autospell list)
ODS --> MicroSoft Outlook Express mailbox file
ODT --> OpenDokument Text Dokument. OpenOffice OASIS XML-based file
OFF --> 3D mesh Object File Format
OFN --> MicroSoft Office FileNew file
OFT --> MicroSoft Outlook template
OKT --> Oktalyzer music module (MOD) file
OLB --> OLE Object Library
OLE --> OLE object
OOGL -> Object Oriented Graphics Library (binary)
OPL --> Organizer Programming Language source file - Psion/Symbian
OPO --> OPL output executable file
OPT --> MicroSoft Developer Studio file
OPX --> OPL extension DLL
ORC --> Oracle 7 script (ASCII)
ORG --> Lotus Organizer file
OR2 --> Lotus Organizer 2 file
OR3 --> Lotus Organizer 97 file
ORA --> Oracle 7 configuration
OSS --> MicroSoft Office Search file
OST --> MicroSoft Exchange/Outlook Offline file
OTL --> Super NoteTab template file (Fookes)
OVL --> Program overlay (binary)

P10 --> Tektronix Plot 10 drawing
P65 --> Pagemaker 6.5 file
P7C --> Digital ID file (MIME)
PAB --> MicroSoft Personal Address Book
PAC --> SB Studio II package
PAD --> Portable Data Description (ASCII) fm ACDSee
PAK --> Quake WAD file (binary)
PAL --> A compressed file (binary)
PAS --> Pascal source code (Borland) (ASCII)
PAT --> (i) DataCAD Hatch pattern file
PAT --> (i) Corel Draw pattern
PAT --> (i) Advanced Gravis Ultrasound/Forte tech. Patch
PBD --> PowerBuilder Dynamic library, an alternative to a native DLL
PBF --> Turtle Beach Pinnacle Bank File
PBK --> MicroSoft Phonebook
PBL --> (i) PowerBuilder Library used in the PowerBuilder
PBL --> (i) development environment
PBM --> Portable bitmap (binary)
PBR --> PowerBuilder Resource
PCD --> (i) Kodak Photo-CD image P-Code compiled test scripts as in
PCD --> (i) MicroSoft Tst and MicroSoft Visual Test
PCE --> Maps Eudora mailbox names to DOS filenames
PCE --> Eudora signature file (ASCII)
PCL --> (i) Hewlett-Packard Printer Control Language file
PCL --> (i) (printer-ready bitmap) (binary)
PCM --> (i) Audio file format
PCM --> (i) OKI MSM6376 synth chip PCM format
PCP --> Symantec Live Update Pro file
PCS --> PICS animation file
PCT --> Macintosh PICT drawing
PCX --> ZSoft PC Paintbrush bitmap (binary) (picture file)
PDB --> (i) UNKNOWN (from Autospell)
PDB --> (i) 3Com Palmpilot database file
PDF --> (i) Adobe Acrobat "Portable Document Format"
PDF --> (i) Netware "Printer Definition File"
PDF --> (i) "Package Definition File" from MicroSoft Systems Management Server
PDQ --> Patton&Patton Flowcharting PDQ Lite file
PF ---> Aladdin Systems Private Files encrypted file
PFA --> Type 1 font (ASCII)
PFB --> Type 1 font (binary)
PFC --> PF Component
PFM --> Printer Font Metrics
PGL --> HP Plotter drawing
PGM --> Portable Graymap (bitmap) (binary)
PGP --> PGP encrypted file
PH ---> Temporary file generated by MicroSoft Help Compiler
PHP --> HTML Script
PHTML > Perl-parsed HTML
PIC --> PC Paint bitmap (binary)
PIC --> Lotus picture file (binary)
PIC --> Macintosh PICT drawing (binary)
PICT -> Mac PICT image file (binary)
PIF --> (i) Program Information File (Binary/ASCII)
PIF --> (i) IBM PIF drawing (binary)
PIG --> Lucas Arts Dark Forces WAD file (binary)
PIN --> Epic Pinball data file
PIX --> Inset Systems bitmap (binary)
PJ ---> MKS Source Integrity file
PJX --> MicroSoft’s Visual Foxpro Project
PJT --> MicroSoft’s Visual Foxpro Project
PKG --> (i) MicroSoft Developer Studio application extension
PKG --> (i) (similar to a DLL file) (binary)
PKR --> PGP Public Keyring
PL ---> Perl program
PLA --> Hypertext script file (ASCII)
PLG --> (i) A file format used by REND386/AVRIL
PLG --> (i) Data file - Oracle Forms 5.0 conversion from Oracle 4.5
PLI --> Oracle 7 data description
PLM --> DisorderTracker2 module
PLS --> DisorderTracker2 sample
PLS --> MPEG PlayList file (used by WinAmp)
PLS --> MP3 File
PLT --> Hewlett Packard Graphics Language Plotter drawing (binary)
PLT --> AutoCAD Plot drawing (binary)
PLT --> Gerber sign-making software
PM5 --> Pagemaker 5.0 file
PM6 --> Pagemaker 6.0 file
PNG --> (i) Portable Network Graphics bitmap (binary)
PNG --> (i)Paint Shop Pro Browser catalogue
PNT --> MacPaint graphic file (binary)
PNTG -> Same as PNT file
POG --> Descent2 PIG file extension
POT --> MicroSoft PowerPoint Template
POV --> Persistence of Vision ray-tracer
PP4 --> Picture Publisher 4 bitmap (binary)
PPA --> MicroSoft PowerPoint Add-in
PPF --> Turtle Beach Pinnacle Program File
PPM --> Portable Pixelmap bitmap (graphics) (binary)
PPP --> Parson Power Publisher
PPP --> Serif PagePlus desktop publishing default output
PPS --> MicroSoft PowerPoint slide show
PPS --> Paint Shop Pro image
PPT --> MicroSoft PowerPoint presentation
PRC --> 3Com Palmpilot resource (text or program) file
PRE --> Lotus Freelance presentation
PRF --> Windows system file
PRF --> Macromedia Director settings file
PRG --> dBase, Clipper, and FoxPro program source files
PRG --> WAVmaker program
PRJ --> 3d Studio (DOS) project file
PRN --> Print Table (space delimited text) (ASCII)
PRN --> DataCAD Windows Printer file
PRS --> Harvard Graphics for Windows presentation (binary)
PRT --> A print-formatted file
PRV --> A PsiMail Internet provider template file
PRZ --> Lotus Freelance Graphics 97 file (binary)
PS ---> Postscript-formatted file (Postscript printer-ready file)
PSB --> Pinnacle Sound Bank
PSD --> Adobe Photoshop bitmap (graphics) (binary)
PSI --> PSION a-law audio (binary)
PSM --> Protracker Studio Module format
PSM --> Sound data for Epic's games
PST --> MicroSoft Outlook Personal Folder File
PTM --> Polytracker music module (MOD) file
PUB --> Ventura Publisher publication
PUB --> MicroSoft Publisher document
PWD --> MicroSoft Pocket Word document
PWL --> Windows 95 password list file
PWP --> Photoworks image file [film roll]
PWZ --> MicroSoft PowerPoint Wizard
PXL --> MicroSoft Pocket Excel spreadsheet
PY ---> Save e-messages from Yahoo

QAD --> PF QuickArt Document
QBW --> QuickBooks for Windows file
QDT --> (i) Quick Books data file from the Quicken UK
QDT --> (i) Accountancy/Tax/Invoice e-program
QD3D -> Apple's QuickDraw 3D Metafile format
QFL --> FAMILY LAWYER document
QIC --> MicroSoft Backup file
QIF --> (i) QuickTime-related image (MIME)
QIF --> (i) Quicken Import File
QIZ --> Question text file (ASCII) (tgs)
QLB --> Quick Library
QM ---> Quality Motion file
QOT --> Quotes text file (ASCII) (tgs)
QRY --> MicroSoft Query
QST --> Quake Spy Tab file
QT ---> QuickTime Movie (binary)
QTD --> Parson's Announcements file (binary)
QTI --> QuickTime-related image (binary)
QTIF -> QuickTime-related image (binary)
QTM --> QuickTime Movie (binary)
QTP --> QuickTime Preferences file
QTS --> Mac PICT image file (binary)
QTS --> QuickTime-related image (binary)
QTX --> QuickTime-related image (binary)
QW ---> Symantec Q&A Write program file
QXD --> Quark XPress file

R ----> Pegasus Mail resource file
RA ---> RealAudio sound file (binary)
RAM --> RealAudio metafile
RAR --> Compressed Archive (Eugene Roshall's format) (binary)
RAS --> Sun Raster Images bitmap (graphics) (binary)
RAW --> (i) Raw File Format (bitmap) (binary)
RAW --> (i) Template file for MemoryMate DBM (binary)
RAW --> (i) Raw signed PCM data
RAW --> (i) sound file, format unknown
RBH --> (i) Maintained by RoboHELP, the RBH file adds to
RBH --> (i) the information contained in the Help project file
RDF --> Resource Description Framework file (related to XML and metadata)
RDL --> Descent Registered Level
REC --> Recorder macro
REC --> RapidComm voice file (binary)
REG --> Registration/Registry file
RES --> MicroSoft Visual C++ Resource
RFT --> (i) Revisable Form Text (part of IBM's DCA or
RFT --> (i) Document Content Architecture)
RGB --> Silicon Graphics file (binary)
RLE --> Run-Length Encoded bitmap (binary)
RL2 --> Descent2 Registered Level
RM ---> RealAudio video file (binary)
RMD --> MicroSoft RegMaid document
RME --> ASCII Readme file (tgs)
RMF --> Rich Map Format (used by 3-D game editors to store a map)
RMI --> MIDI music sequence (binary)
RMJ --> RealJukebox file (binary)
RMX --> RealJukebox file (binary)
ROV --> Rescue Rover data file
RPM --> RedHat Package Manager package (for Linux)
RPT --> MicroSoft Visual Basic Crystal Reports file
RRS --> save file for the ace game Road Rash
RSL --> Borderland's Paradox 7 reports
RTF --> Rich Text Format document
RTM --> Real Tracker music module (MOD) file
RTK --> Used by RoboHELP to simulate the search feature of Windows help
RTS --> (i) RealAudio's RTSL document
RTS --> (i) RoboHELP to speed complex operations
RUL --> Extension used in InstallShield
RVP --> MicroSoft Scan Configuration file (MIME)
RXX --> (i) RAR compressed files from a multi-volume archive
RXX --> <!>(XX = a number from 01 to 99) (binary)

S ----> Assembler source code
S3I --> Scream Tracker v3 instrument
S3M --> Sound module file for ScreamTracker v3
SAM --> (i) Ami Professional document
SAM --> (i) Signed 8bit sample data
SAV --> Saved game file
SB ---> Raw Signed Byte (8bit) data
SBK --> (i) Creative Labs Soundfont 1.0 Bank file
SBK --> (i) (Soundblaster)/EMU SoundFont v1.x Bank files
SBL --> Shockwave Flash object
SC2 --> MicroSoft Schedule+ 7 file format
SC2 --> SAS catalog (Windows 95/NT, OS/2, Mac)
SCC --> MicroSoft Source Safe file
SCD --> Matrix/Imapro SCODL slide image
SCD --> MicroSoft Schedule+ 7
SCF --> Windows Explorer command file
SCH --> MicroSoft Schedule+ 1
SCI --> ScanVec Inspire Native file format
SCN --> TrueSpace2 scene
SCP --> Dial-Up Networking Script (ASCII)
SCR --> Windows screensaver (binary) (Executable!)
SCR --> Fax image (binary)
SCT --> (i)SAS catalog (DOS)
SCT --> (i) Scitex CT bitmap (binary)
SCT --> (i) MicroSoft FoxPro forms
SCT01 > SAS catalog ((UNIX))
SCV --> ScanVec CASmate Native file format
SCX --> MicroSoft FoxPro forms
SD ---> Sound Designer I audio (binary)
SD2 --> Sound Designer 2 flattened file/data fork
SD2 --> SAS database (Windows 95/NT OS/2, Mac)
SDF --> System Data File Format - legacy Unisys (Sperry) format
SDK --> Roland S-series floppy disk image
SDL --> SmartDraw library (binary)
SDR --> SmartDraw drawing (binary)
SDS --> Raw Midi Sample Dump Standard file
SDT --> SmartDraw template
SDV --> Semicolon Divided Values file
SDW --> Lotus WordPro graphic file (binary)
SDW --> Raw Signed DWord (32bit) data
SDW --> Folio Shadow file
SDX --> Midi Sample Dump Standard files compacted by SDX
SEA --> (i) Self-expanding archive (used by Stuffit for Mac
SEA --> (i) files and possibly by others) (binary)
SEP --> Tagged Image File Format (TIFF) bitmap (binary)
SES --> Cood Edit Session file (common digital audio editor file )
SET --> File set for MicroSoft backup
SF ---> IRCAM SoundFile format
SF2 --> Emu SoundFont v2.0 file (binary)
SFD --> SoundStage Sound File Data (binary)
SFI --> SoundStage Sound File Info (binary)
SFL --> Soft fonts file (binary)
SFP --> Soft fonts file (binary)
SFR --> Sonic Foundry Sample Resource
SFW --> Seattle Film Works (Mangled JPEG) (binary)
SFX --> RAR self-extracting archive (binary)
SF2 --> Creative Labs Soundfont 2.0 Bank file (Soundblaster)
SGML -> Standard Generalized Markup Language (ASCII)
SHB --> (i) Corel Show presentation
SHB --> (i) Document shortcut file
SHG --> Hotspot bitmap (binary)
SHP --> (i) 3D Studio (DOS) shapes file (binary)
SHP --> (i) File format used by some programs for 3D
SHP --> (i) modeling of multipart interactive triangle models
SHS --> Shell scrap file
SHW --> Corel Show presentation
SIG --> Signature file
SHTML > HTML file containing Server Side Includes (SSI)
SIT --> Stuffit archive of Mac files (binary)
SIZ --> Oracle 7 configuration
SKA --> PGP secret Keyring
SKD --> Autosketch Drawing Base (binary)
SKL --> Macromedia Director resource file
SL ---> PACT's Save Layout extension
SLB --> AutoDesk Slide Library File Format
SLD --> AutoDesk Slide File Format
SLK --> Symbolic Link (SYLK) spreadsheet
SM3 --> DataCAD Symbol file
SMP --> (i) Samplevision format
SMP --> (i) Ad Lib Gold Sample
SND --> (i) NeXT sound
SND --> (i) Mac Sound Resource
SND --> (i) Raw unsigned PCM data
SND --> (i) AKAI MPC-series sample
SNDR -> Sounder sound file
SNDT -> Sndtool sound file
SOU --> SB Studio II sound
SPD --> Speech Data file
SPL --> (i) Shockwave Flash Object
SPL --> (i) Digitracker Sample
SPP --> UNKNOWN (from Autospell)
SPPACK> SPPack sound sample
SPRITE> Acorn's bitmap format (binary)
SQC --> Structured Query Language (SQR) common code file
SQL --> (i) Informix SQL queries
SQL --> (i) Generally used by database products as an extension
SQL --> (i) for SQL queries (scripts, text, or binary)
SQR --> Structured Query Language program file
SRT --> alpha sorted text file (tgs) (ASCII)
SSD01 > SAS data sets ((UNIX))
SSD --> SAS database (DOS)
SSI --> Server Side Include
STF --> UNKNOWN (ASCII)
STM --> (i) Shorter suffix for .shtml, an HTML file containing
STM --> (i) a Server Side Include (SSI)
STM --> (i) Scream Tracker v2 music module (MOD) file
ST ---> Atari ST disk image
STR --> Screensaver extension (binary)
STY --> Ventura Publisher style sheet
SVX --> (i) Amiga 8SVX sound
SVX --> (i) Interchange file format, 8SVX/16SV
SW ---> Raw signed Word (16bit) data
SWA --> Shockwave audio file in Macromedia Director (an MP3 file)
SWF --> Shockwave Flash object
SWP --> DataCAD Swap file
SXW --> Open Office Document (www.openoffice.org - free download)
SYS --> System file
SYW --> Yamaha SY-series wave files

TAB --> Guitar Tablature file
TAR --> Tape Archive (binary)
TAZ --> (UNIX) Gzip/Tape Archive (binary)
TBK --> Asymetrix Toolbook interactive multimedia files
TCL --> Script in the TCL/TK Language
TDB --> Thumbs Plus database
TDDD -> A file format use by the Imagine & Turbo Silver ray-tracers
TEX --> Texture file
TGA --> Targa bitmap (binary)
TGS --> Personal file, eg, Tom Stewart's File (ASCII) (tgs)
TGZ --> (UNIX) Gzip/Tape Archive (binary)
THEME > Windows 95 Desktop Theme
THN --> Graphics Workshop for Windows thumbnail (binary)
TIB --> UNKNOWN (from Autospell)
TIF --> Tagged Image File Format bitmap (binary)
TIFF -> Tagged Image File Format bitmap (binary)
TIG --> Tiger file, used by US government to distribute maps
TLB --> OLE Type Library
TLE --> Two-Line Element set (NASA)
TMP --> Windows temporary file
TOC --> Table of contents of Eudora mailboxes
TOL --> Kodak photoenhancer
TOS --> Operating System for Atari 16/32 and 32/32 computers
TPL --> CakeWalk Audio Template file
TPL --> DataCAD Template file
TPP --> Teleport Pro Project
TRK --> Kermit script file
TRM --> Terminal file
TRN --> MKS Source Integrity project usage log
TSK --> UNKNOWN (from Autospell)
TTF --> TrueType font (binary)
TTK --> Corel Catalyst Translation Tool Kit
TWF --> TabWorks file
TWW --> Tagwrite Template
TX8 --> MS-DOS text (ASCII)
TXB --> Descent/D2 Encoded Briefing File
TXT --> ASCII text-formatted audio data
TXT --> In most cases an ASCII text file (tgs) (ASCII)
TXW --> Yamaha TX16W wave files
TZ ---> Old compression format file (binary)
T2T --> Sonata CAD modeling software file

UB ---> Raw unsigned byte (8-bit) data
UDF --> Windows NT Uniqueness Database File
UDW --> Raw unsigned doubleword (32-bit) data
ULAW -> US telephony format (CCITT G.711) audio
ULT --> Ultratracker music module (MOD) file
UNI --> MikMod UniMod formatted file
URL --> Internet shortcut file
USE --> MKS Source Integrity file
UU ---> UU-encoded file
UUE --> UU-encoded file
UW ---> Raw unsigned word (16-bit) data
UWF --> UltraTracker Wave file

V8 ---> Covox 8-bit audio file
VAP --> Annotated speech
VBA --> VBase file
VBP --> Visual Basic Project
VBS --> Visual Basic Script
VBW --> MicroSoft Visual Basic workspace
VBX --> Visual Basic custom control
VCE --> (i) Natural MicroSystems (NMS) unformatted voice file
VCE --> (i) (used by Cool Edit)
VCF --> Virtual card file (Netscape)
VCF --> (i) Vevi configuration file; defines objects for use
VCF --> (i) with Sense8's WorldToolKit
VCT --> MicroSoft FoxPro class library
VCX --> MicroSoft FoxPro class library
VDA --> Targa bitmap (binary)
VI ---> (i) Virtual Instrument file from National Instruments
VI ---> (i) LABView product
VIFF -> Khoros Visualization format
VIR --> (i) File identified as a virus-infected file by
VIR --> (i) Norton AntiVirus and possibly others
VIV --> VivoActive Player streaming video file
VIZ --> Division's dVS/dVISE file
VLB --> Corel Ventura Library
VMF --> FaxWorks audio file
VOB --> DVD-video container format - MPEG2-based stream format
VOC --> Creative Labs Sound Blaster audio file
VOX --> Dialogic audio file coded using ADPCM
VOX --> Natural MicroSystems (NMS) formatted voice file
VOX --> Talking Technology audio file
VP ---> Ventura Publisher publication
VQE --> Yamaha Sound-VQ Locator file
VQF --> Yamaha Sound-VQ file (possible emerging standard)
VQL --> Yamaha Sound-VQ Locator file
VRF --> Oracle 7 configuration
VRML -> A Virtual Reality Modeling Language file
VSD --> Visio drawing (flow chart or schematic)
VSL --> Download List file (GetRight)
VSS --> Visio Stencil file
VST --> Targa bitmap (binary)
VSW --> Visio Workspace file
VTC --> DICTIONARY file for AUTOSPELL
VTD --> DICTIONARY file for AUTOSPELL
VXD --> MicroSoft Windows virtual device driver

WAB --> MicroSoft Outlook file
WAD --> (i)Large file for Doom game containing video
WAD --> (i)player level, and other information
WAV --> Windows Waveform sound
WB1 --> QuattroPro for Windows spreadsheet
WB2 --> QuattroPro for Windows spreadsheet
WBK --> MicroSoft Word Backup Document
WBL --> Argo WebLoad II upload file
WBR --> Crick Software WordBar File
WBT --> Crick Software Wordbar Template
WCM --> WordPerfect Macro
WCM --> MicroSoft Works 4.0 Communication file
WDB --> MicroSoft Works 4.0 database
WEB --> CorelXara Web document
WFB --> Turtle Beach WaveFront Bank (Maui/Rio/Monterey)
WFD --> Turtle Beach WaveFront Drum set (Maui/Rio/Monterey)
WFN --> symbols for use in Corel Draw
WFP --> Turtle Beach WaveFront Program (Maui/Rio/Monterey)
WGP --> Wild Board Games data file
WGT --> MicroSoft NetMeeting Whiteboard
WID --> Ventura width table
WIL --> WinImage file
WIZ --> MicroSoft Word Wizard
WK1 --> Lotus 123 versions 1 & 2 spreadsheet
WK3 --> Lotus 123 version 3 spreadsheet
WK4 --> Lotus 123 version 4 spreadsheet
WKS --> Lotus 123 Worksheet spreadsheet
WKS --> MicroSoft Works 4.0 Sheet or Chart
WLD --> REND386/AVRIL file
WLF --> Argo WebLoad I upload file
WLL --> MicroSoft Word Add-In
WMA --> Windows Media Audio - compressed audio file format
WMF --> Windows Metafile (graphics) (binary)
WMV --> Windows Media Video - compressed video file format
WOW --> Grave Composer music module (MOD) file
WP ---> WordPerfect document
WPW --> Novel PerfectWorks document
WP4 --> WordPerfect 4 document
WP5 --> WordPerfect 5 document
WP6 --> WordPerfect 6 document
WPC --> UNKNOWN (binary)
WPD --> WordPerfect Demo
WPD --> WordPerfect Document
WPG --> WordPerfect Graphic file (bitmap or vector) (binary)
WPS --> MicroSoft Works document
WPT --> WordPerfect Template
WQ1 --> QuattroPro/DOS spreadsheet
WQ2 --> QuattroPro/DOS version 5 spreadsheet
WR1 --> Lotus Symphony
WRI --> Write document
WRK --> Cakewalk music audio project file
WRL --> Virtual Reality model
WRZ --> Another VRML fileject
WS1 --> WordStar for Windows 1 document
WS2 --> WordStar for Windows 2 document
WS3 --> WordStar for Windows 3 document
WS4 --> WordStar for Windows 4 document
WS5 --> WordStar for Windows 5 document
WS6 --> WordStar for Windows 6 document
WS7 --> WordStar for Windows 7 document
WSD --> WordStar 2000 document
WSE --> UNKNOWN (from Autospell)
WTA --> UNKNOWN (from Autospell)
WVL --> Wavelet Compressed Bitmap (binary)
WWL --> MicroSoft Word add-in file

X ----> AVS image format
XAR --> Corel Xara drawing
XBM --> A-MIME 'xbitmap' image (binary)
XCF --> The GIMP image format (Linux tegneprogram)
XI ---> Instrument sample file for ScreamTracker
XIF --> Wang imaging file (comes with Windows 95)
XLA --> MicroSoft Excel add-in
XLB --> MicroSoft Excel toolbar
XLC --> MicroSoft Excel chart
XLD --> MicroSoft Excel dialogue
XLK --> MicroSoft Excel backup
XLL --> MicroSoft Excel add-in file
XLM --> MicroSoft Excel macro
XLS --> MicroSoft Excel worksheet
XLT --> MicroSoft Excel template
XLV --> MicroSoft Excel VBA module
XLW --> MicroSoft Excel workbook / workspace
XM ---> FastTracker 2, Digital Tracker music module (MOD) file
XML --> Extensible Markup Language
XNK --> MicroSoft Exchange shortcut file
XPM --> X BitMap format (binary)
XR1 --> Epic MegaGames Xargon data file
XTP --> XTree data file
XWD --> X Window Dump format
XWF --> Yamaha XG Works file (MIDI sequencing)
XXX --> ASCII letter template file (tgs)
XY3 --> XYWrite III document
XY4 --> XYWrite IV document
XYP --> XYWrite III Plus document
XYW --> XYWrite for Windows 4.0 document
X16 --> Macromedia Extra (program extension), 16 bit
X32 --> Macromedia Extra (program extension), 32 bit

YAL --> Arts & Letters clip art library
YBK --> MicroSoft Encarta Yearbook

Z ----> (UNIX) Gzip compressed archive (binary)
ZIP --> Zip file Compressed archive (binary)
ZOO --> An early compressed file format (binary)

(i) = Multiple line entry
Last update: KM_Tuesday, May 26, 2009