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- Common and Uncommon File Extensions (19SEP89)
- ?Q? "sQueezed" (CP/M)
- ?Z? "crunched" (CP/M) (possibly, Unix "compressed" file)
- !!! important file (READTHIS.!!!)
- $$$ Temporary file (MS EDLIN, et al.)
- 1ST information file (README.1ST)
- 2FL Pibterm Config and AUTOEXEC templates
- 3TP "v3 Turbo Pascal" source
- 4TH "FORTH" language source
- @@@ Backup ID file (MS)
- @@@ IBM Macro Assembler/2 MASMDIR.@@@
- A "Assembler" source (Unix)
- A86 assembler source (DRI?)
- ACC desk "ACCessory" (Lotus Metro)
- ACO "AreaCOde" (Pibterm)
- AD promotional info
- ADA "ADA" language source
- ADB "ADa package Body"
- ADD "ADD-in menu" (Lotus Manuscript)
- ADF "Adapter Description File" (Emerald 3Xmate 5250 emulator)
- ADL "ADvanceLink" (HP Term Emulator)
- ADN "ADd-iN utility" (Lotus 123 v2)
- ADS "ADa package Specification"
- ADV "ADVertisement", "ADVanced" or "ADVenture"
- AGA "AGendA 'database'" (Lotus)
- AGB "AGenda 'dataBase'" (Lotus)
- AGE "AGEd messages" (TapOrder)
- ALF "ALFcrunch" file compression/archive (Atari)
- ALG "ALGorithm" description (text), "ALGol" lang source
- ALL printer defintion (WordPerfect)
- ALM "ALarM" (HP Portable PAM)
- ALT "ALTernate" menu (Borland Quattro)
- ANN "ANNouncement"
- ANS "ANSi" graphic (requires ANSI.SYS loaded)
- ANS PCF:dB-related (Buttonware)
- APL "A Programming Language" language source
- APL "AirPLane" (?) (MS FS3)
- APL (sometimes, "APpLe"-related)
- APP "APPlication" (R:Base)
- APP (sometimes, "APPle"-related)
- ARC "ARChive" (SEA, et al.)
- ARK "ARCHive" (usually, SEA format; usually, non-MSDOS)
- ART "ARTicle" or "ARTwork" (graphic)
- ASC "ASCii" text file
- ASC (sometimes, BAS pgm saved in txt/non-token/plain fmt)
- ASF APL data file (STSC)
- ASI "ASsembly language Include" file
- ASM "ASseMbly" language source
- ASP "ASPect language script" (Datastorm Procomm+)
- AUX "AUXiliary"
- AWK "AWK" language program (Unix)
- AWS "APL Work Space" (STSC)
- BAK "BAcKup" file (MicroPro WS, et al.)
- BAQ "BACKup" file (ProFon Edit, Quattro?)
- BAR popular "example" file (FOO.BAR)
- BAS "BASic" language source
- BAT "BATch" file (COMMAND.COM commands)
- BF "BradFord" print utility
- BF? "BradFord" print utility related
- BFF "BradFord Font"
- BGI "Borland Graphic Interface" driver
- BI "Borland, Inc." related (?)
- BIN "BINary" image
- BIO "BIOgraphical" information or system "BIOs"
- BIT "BITmap image" (Lotus Manuscript, et al.)
- BIX "Byte Information eXchange" log
- BK! "BacKup!" (WordPerfect v5)
- BKU "BacKUp" (TIMESLIPS)
- BLD "BuiLD" (similar to "make")
- BLD BASIC "BLoaD" (recommended for graphic images)
- BLD "BLoaDable graphics" (VGACAD)
- BQY ?
- BSV BASIC "BSaVe" (recommended for non-graphic images)
- BUF "BUFfer"
- BUG "ladyBUG" language source
- BUG (usually, software trouble report)
- BUY purchase or shareware license info (?)
- C C language source
- C00 print to disk output (Ventura Publisher)
- CAL "CALendar" (MS Windows, et al.)
- CAL "SuperCALc" worksheet
- CAP "CAPtion" (Ventura Publisher)
- CAT "CATalog" (DB3, TAPCIS, CATSCAN, et al.)
- CAZ compressed (Unix) CAT file
- CBL COBOL language source
- CDR "Corel DRaw"
- CFG "ConFiGuration"
- CGF "ConfiGuration File" (?) (Novell?)
- CGM "Computer Graphic Metafile"
- CHG "CHanGe" (usually, a text file)
- CHK "CHecKdisk" file, "CHecKoff" sheet
- CHN "CHaiN" file (Turbo Pascal)
- CHP "CHaPter" (part of document) (Ventura Publisher)
- CHR "CHaRacter" or font file
- CHT (Harvard Graphics-related?)
- CIF "Chapter Information File" (Ventura Publisher)
- CIS "CompuServe Info Svc" related (TAPCIS)
- CLD (VAX)
- CLP "CLiP graphic files" (VGACAD)
- CM "Compiled Macro" (Brief editor)
- CMD "CoMmanD"
- CMP "CoMParison" (MS Word)
- CMP "CoMPonent" (Generic CADD)
- CMP "CoMPressed" (Lotus 1-2-3 loaded by 123.EXE)
- CNF "CoNFiguration"
- CNF printer "CoNFiguration" (Ventura Publisher)
- COB "COBol" language source or object module
- COD "CODe" or object listing
- COM "COMmand" (VAX VMS batch file, text)
- COM "COMmand" executable (CP/M, MS-DOS)
- CPI "Code Page" (DOS international character support)
- CPM "CP/M command file" (for use with some MS-DOS emulators)
- CPY (Fastback Plus history file?)
- CRD "CaRD" (e.g., MS Windows)
- CRF "Cross ReFerence" (MS XREF, et al.)
- CRS "Conversion ReSource" (WordPerfect v5)
- CSV "Comma Separated Value" (Popkin SA)
- CTL "ConTroL"
- CUR "CURrent"
- CV "CodeView"-related (MS)
- D?? "Disk # ??" (README.D??)
- DAT "DATa"
- DB Paradox "Data Base" (Borland)
- DB dBase III+ configuration file (CONFIG.DB)
- DB2 dBase 2 DBF (Quattro convention)
- DB? generic "Data Base"
- DBA "Data BAse" (Turbo Prolog)
- DBD (Norton, et al)
- DBF "Data Base File" (AT dBASE 2&3)
- DBG "DeBuG" (MS COBOL, Quicksilver)
- DBT "Data Base Text" (memo content) (AT dBASE 3)
- DCA "Document Content Architecture" (IBM meta-document fmt)
- DCA (RELAY GOLD)
- DCL "DEC Control Language"
- DCT "DiCTionary"
- DD "Data Dictionary" (Cadre PCSA)
- DEF "DEFinitions" (MS Mouse menu) or "DEFaults"
- DEM "DEMonstration" (Lotus 123, MS FS3)
- DEP "DEPendencies" (Borland Turbo Pascal v4)
- DES "DEScription"
- DEV "DEVice" driver
- DFD "Data Flow Diagram" (Cadre PCSA)
- DFT "DeFaulTs" (Sideways)
- DGM "DiaGraM" (Popkin SA)
- DGX "DiaGram indeX" (Popkin SA)
- DIC "DICtionary"
- DIC hyphenation "DICtionary" (Ventura Publisher)
- DIF "Data Interchange Format" (VisiCalc, Lotus 123)
- DIR "DIRectory"
- DIV "DIVision" (part of document)
- DMP "DuMP"
- DO "DO" (similar to "make")
- DOC "DOCument" (MS Word & Multimate default extension)
- DOW "DOWnload" instructions (TAPCIS)
- DRS "Driver ReSource"? (WordPerfect v5)
- DRV device "DRiVer"
- DRW "DRaWing" (Lotus Freelance)
- DSC "DeSCription" (Carbon Copy)
- DSK "DiSK"
- DSS (Carbon Copy)
- DTA "DaTA"
- DUM "DUMmy" (?)
- DV "DesqView" script (Quarterdeck)
- DV? "DesqView"-related (Quarterdeck)
- DVC "DeViCe"
- DVH ?
- DVO ?
- DVP "DesqView Program" (like MS Windows PIF)
- DVR device "DriVeR"
- DVS "DesqView command Script" (Quarterdeck)
- DWC "Dean W. Cooper" special file compression/archive
- DWG "DraWinG" (AutoCAD)
- DXF some sort of graphic
- DYN (Lotus 123)
- EDX "EDiX" (EDIX editor configuration file)
- EEE EXE file when debugging as a disk image
- EKA "EureKA" file (Borland)
- EMM "Executive MemoMaker" (HP Word Processor)
- ENG "ENGine" (Borland Sprint)
- ENV "ENVironment" (?) (Lotus Metro, Agenda)
- EPS "EPSon" formatted print file
- EPS "Encapsulated PostScript"
- EQN "EQuatioN"
- ERM "ERror Message"
- ERR "ERRor"
- EXE "EXEcutable" (LINK output)
- EXP "EXPort"
- F?? "Form # ??" (Paradox)
- FB "FastBack" script
- FCN "FunCtioN"
- FCT "FaCT"
- FFN "Freelance FoNt" (Lotus Freelance)
- FI "File Information" (Norton Utilities)
- FI? "Flight Instruction" (EA CYAFT1)
- FIG "FIGure"
- FIL "FILe" (Generic CADD)
- FIL generic "FILe"
- FIX correction instructions
- FLB "FreeLance Batch" (?)
- FLB (MS FS3)
- FLE generic "FiLE"
- FLY aircraft parameters (EA CYAFT1)
- FMT "ForMaT" or "ForMaTted text" (from command-driven formatters)
- FNC "FuNCtion" key definition (Pibterm)
- FNT "FoNT" (Ventura Publisher, Lotus 123, PBrush, et al.)
- FON "FONt" or "PHONes"
- FOR "FORtran" language source
- FOX (Foxbase-related ?)
- FP (sometimes, APPLE or other "Floating Point" BASIC)
- FRM "FoRM" or "FRaMe"
- FRS "Font ReSource" (WordPerfect v5)
- FS3 (MS FS3)
- FT "FonT"
- FTN "ForTraN" language source
- FUL (Fastback plus related ?)
- FUN "FUNction" include file
- FX (Foxbase-related ?)
- FY (Buttonware PCF)
- GD "Graphics Driver"
- GDE "GuiDE"
- GED "Graphics EDitor"
- GEM line art graphic (GEM)
- GEN "GENerated text" (Ventura Publisher)
- GFX "GraPHiCS"
- GID "GuIDe"
- GIF "Graphic Interchange Format" (CIS)
- GLO "GLObal" declaration include file
- GLY "GLossarY" (MS Word, et al.)
- GMF computer "Graphics MetaFile"
- GRA "GRAphics" driver (MS FS3)
- GRB "GRaB" (snapshot) (MS Windows)
- GRF "GRaPH"
- GX1 "GraphiCS" (Show Partner)
- H C language "Header" include file
- HDB "HanDBook" (?)
- HDB "Headers for Data-Base" (Buttonware PCF:dB)
- HDR "HeaDeR"
- HEX Intel or other "HEXadecimal" format
- HIS "HIStory" or "HIStogram"
- HLB "Help LiBrary" (VAX VMS)
- HLP "HeLP"
- HNT "HiNT"
- HOF "Hall Of Fame" (game scores)
- HOF (Accolade Mean 18)
- HPG "Hewlett-Packard Graphics"
- HST "HiSTory" or "HoST" or "HiSTogram"
- HY? "HYphenation algorithm" (Ventura Publisher)
- HYP "HYPertext"
- HYP "HYPhenation" dictionary
- I "Include" source
- IBM "Intl Business Machines" PC or clone related
- ICB (graphics)
- ICN "ICoN" language source
- ICO "ICOn" image (?)
- IDN (Popkin SA, AT dBASE?)
- IDX "InDeX"
- IMG "IMaGe"; maybe GEM Paint graphic
- IN "INput"
- INC "INClude" file
- INF "INFormation"
- INI "INItialization"
- INP "INPut"
- INS "INSert" (overlay or include) or "INStructions"
- INT "INTerpreted" file (usually by a run-time module)
- INT (sometimes, APPLE or other "INTeger" BASIC program)
- INX "INdeX" (Buttonware PCF)
- ION CONVERS.ION (WordPerfect v5)
- JNK "JuNK" (temporary file - discardable)
- KBD "KeyBoarD"
- KBM "KeyBoard Map"
- KED "KEDit" command file
- KEX "KEdit rexX" command file
- KEY "KEYboard" or "KEY field"
- KPG "Keyboard ProGram"
- KSM (Lotus Metro)
- LBL "LaBeLs"
- LBR "LiBRary" format (usually CP/M)
- LCK "LoCK" (Popkin)
- LET "LETter" or other correspondence
- LEX "LEXicon"
- LG "LOG"
- LIB object "LIBrary"
- LIS "LISting"
- LJ "LaserJet" print file
- LJ2 "LaserJet II" print file
- LNK "LiNK"
- LOD "LOaD" module or overlay
- LOG information retention file
- LSP "LiSP" language source
- LST "LiSTing"
- LTG "LisTinG"
- LTR "LeTteR" or correspondence
- LVF Font (?) (Lotus Manuscript)
- LZH LHARC special file compression/archive
- LZS LARC special file compression/archive
- M "Macro" (BRIEF editor)
- M "Matlab" script/function (MW)
- M18 "Mean-18" related (recreational) (Accolade)
- M2 "Modula 2" language source
- MAC "MACintosh"-related (Apple)
- MAC "MACro" (WordPerfect v4, et al.), "MAChine" code
- MAI "MAIl" (VAX VMS)
- MAK "MAKe"
- MAN "MANual"
- MAP "MAP" file (compiler or linker output)
- MAR "MAcRo" assembly language source (VAX VMS)
- MAT "MATrix workspace" (MW MATLAB)
- MCD "MathCaD" related
- MCP MathCAD related (?)
- MCP "MonoChrome Picture" (?)
- MCW "MaCWrite" format (Apple MacIntosh)
- MD special file compression/archive
- MDF "Menu Definition File" (AUTOMENU)
- ME introductory info (READ.ME)
- ME! important info (READ.ME!)
- ME2 an also-read file (READ.ME2)
- MEM "MEMorandum", "MEMory image", "MEMory variables"
- MEN "MENu"
- MES "MESsage"
- MET "graphic METafile" (MW MATLAB)
- MEX (MW MATLAB)
- MK "MaKe file" (MAKE, NDMAKE)
- MNU "MeNU" file (often, mouse-related)
- MNX menu source (AutoCAD)
- MOD "MODule" or "MODula-2" language source
- MP? "MaP" (World Digitized)
- MRK "MaRKed" messages (TAPCIS)
- MS "ManuScript"
- MS? "MicroSoft"-related files
- MSC "MiSCellaneous" info
- MSG "MeSsaGes" (MS COBOL, TAPCIS, et al.)
- MSP "MS windows Paint"
- MST "MaSTer"
- MUS "MUSic" (Rubenking PIANOMAN v3)
- MUZ "MUZak" music file
- MUZ "MUZic" (Rubenking PIANOMAN v4)
- NDX "iNDeX"
- NEW (usually, update info) (WHATS.NEW)
- NOT "NOTe"
- NOW info file (README.NOW)
- NRO "NROff" input file
- NTS "NoTeS"
- NTX ???
- NUD (file contents undressed)
- NWS "NeWS"
- OBJ relocatable "OBJect" code
- OFF (sometimes, "nrOFF" or "trOFF" input files)
- OLB "Object LiBrary" (VAX VMS)
- OLD info about previous version, or a backup file
- OLY "OverLaY"
- ONE (Mathtec Formula One)
- OPT "OPTions"
- ORA "ORAcle"-related
- ORG "ORGanization" or "ORiGinal"
- ORI "ORIginal"
- OUT "OUTput"
- OV? "OVerlay # ?"
- OVL "OVerLay"
- OVR "OVeRlay"
- OWN personal Today-in-history file
- P "Pascal" include file (whole pgm in Unix)
- P* (Mentor Graphics)
- PAK special file compression/archive (PKware, et al.)
- PAL "PALlette" (graphics)
- PAR "PARameters" or "PARagraph"
- PAS "PAScal" language source
- PAT "PATtern", "PATch"
- PCC "Picture image Cut/Copy" (Zsoft Paint)
- PCK "PiCK" (Turbo Pascal)
- PCO "PC-Outline" related
- PCT "PiCTure"
- PCT Macintosh PICT
- PCX picture image (Zsoft Paint)(PC Paintbrush)
- PD "Printer Driver"
- PDF "Printer Description File" (Borland, Lotus)
- PDV "Paintbrush DeVice driver" (MS Paintbrush)
- PDX "ParaDoX" files (Borland)
- PFM Pagemaker-related (Aldus)
- PGM "ProGraM"
- PHN "PHoNe"
- PIB "PIBterm" related (Burns)
- PIC "PICture" (Lotus 123, Dr Halo, Videoshow, et al.)
- PIE "Prolog Inference Engine" (Borland)
- PIF "Program Information File" (MS Windows)
- PIT "Packed stuffIT" format (?) (Macintosh)
- PLN "PLaN"
- PLT "PaLaTte" (VGACAD)
- PLY "PLaY" (?)
- PNL "PaNeL" (Relay Gold)
- PNT "PaiNT" (MacIntosh)
- PP "Pretty-Printed"
- PR "Press Release"
- PRD "PRinter Driver" (MS Word)
- PRE "PREfix", "PREsentation" script (MC Dr. Halo)
- PRG "PRoGram" (AT dBASE)
- PRJ "PRoJect"
- PRL "Press ReLease"
- PRM "PaRaMeter"
- PRN "PRiNter"
- PRO "PROlog" language source
- PRS "Printer ReSource" (WordPerfect v5)
- PRT "PReTty-printed"
- PS "PostScript"
- PSP Pagemaker-related (Aldus)
- PTF "Program Temporary Fix" (Relay Gold)
- PTS "PoinTS" (game scores? vector graphic plots?)
- PUB "PUBlication" (Ventura Publisher)
- PWD "PassWorD"
- PX "Primary indeX" (Borland Paradox)
- Q "Questions"
- QA "Questions and Answers"
- QAI "Quattro Add-In" (Borland)
- QB "QuickBasic" (MS)
- QC "Quick C" related (MS)
- QLB "Quick LiBrary" (MS)
- QPU "Quick Pascal Unit" (MS)
- QRY "QueRY" (AT dBase)
- QS "QuickSilver"-related file
- QSN "Quick ScaN" (TAPCIS)
- QUE "QUEstions", "QUEry"
- R? "Report # ?" (Paradox)
- RAC "RACecourse" (EA CYAFT1)
- RC "ResourCe script" (MS Windows)
- RCD "Removable Cartridge Drive" (Iomega Bernoulli)
- REF "REFerence" or "cross-REFerence"
- REL "RELease" (PRESS.REL)
- REL "RELocatable" object code (CP/M)
- REP "REPort" or "REPly"
- REQ "REQuest"
- RES compiled "RESource" file (MS Windows)
- RFL "ReFLection" command file
- RFN "Raster FoNt" (Lotus Freelance)
- RFR "ReFeRence"
- RFT "Revisable Format Text" (IBM fmt, see "DCA")
- RLE "Run Length Encoded" graphic (CIS, et al.)
- RLS "ReLeaSe" (PRESS.RLS)
- RNF "RuNoFf" input
- RPT "RePorT"
- RSC main menu (Borland Quattro)
- RSC "ReSourCe" ?? (DRI GEM??)
- RSP linker "ReSPonse" file
- RST "state ReSToration" (Brief editor status)
- RUL "RULe"
- S?? "System/??" (IBM host comms)
- SA "System Analysis" (Cadre PCSA)
- SAV "SAVe" file (for backup)
- SC "SCript" (Borland Paradox)
- SCG "Screen Capture Graphic" (Lotus Manuscipt)
- SCN "SCreeN" or "SCeNery" (e.g., MS FS3)
- SCR "SCReen" or "SCRipt" (comms, debug)
- SCT "Screen Capture Text" (Lotus Manuscript)
- SDF "System Data Format" (AT dBASE)
- SDR "Screen DRiver" (Lotus Metro)
- SEC "SECtion" (TAPCIS or part of doc)
- SEQ "SEQuential" file (sometimes, ASCII graphics)
- SER (Lotus Freelance)
- SET driver SET (Lotus 123)
- SFL "Soft Font Landscape"
- SFP "Soft Font Portrait"
- SH "SHell" archive (shar) (Unix)
- SHP "SHaPe" (AutoCAD)
- SHR "SHaRe" (DESQview)
- SHX "SHape" source (AutoCAD)
- SHZ compressed SH (Unix)
- SIM "SIMulation" (e.g., MS FS3)
- SIN (unknown, but too titillating for me to take out)
- SIT "StuffIT" (Macintosh)
- SIX "SIXel" file (VAX graphics)
- SKD "SCHeDule"
- SLD "SLiDe" (AutoCAD, Lotus Freelance)
- SLD "Source Line Debugger" (Lahey)
- SLK "Script Language Kommands" (?) (HP AdvanceLink)
- SLK "SyLK" (?)
- SM ?? (Prodigy, config.sm)
- SNO "SNObol" language source
- SOB (probably not what you think)
- SOL (Clip3D graphic)
- SOM (Paradox)
- SOR (Paradox)
- SP? "SPrint" files (Borland)
- SPC "SPell Check" (Lotus Manuscript)
- SPG "SPrint Glossary"
- SPL "SPeLling" dictionary
- SPM "SPrint Macro"
- SPR "SPRint" document (Borland default extension)
- SPS Sideways (Funk) Lotus 123 addin setup file
- SQL "Standard [sic] Query Language"
- SQZ "SQueeZed" (SAYWHAT?! compressed screen)
- SRC "SouRCe"
- SSF Enable-related
- ST? "STunt" (EA CYAFT1)
- STF "Structured Text File" (Lotus Agenda)
- STY "STYlesheet" (MS Word, WordPerfect, Ventura Pub)
- SUB "SUBroutine" include file
- SUB "SUBmit" script (CP/M)
- SUM "SUMmary"
- SUP "SUPlemental dictionary" (WordPerfect v5)
- SW? ?
- SWP "SWaP" (Borland Sprint)
- SYL "SYLk" format
- SYM "SYMbol"
- SYN "SYNonym"
- SYS "SYStem configuration" (MS-DOS) (text)
- SYS "SYStem" or device driver (MS-DOS) (binary)
- T@? Timeline-related file (Symatec)
- TAB "TABle"
- TAR "Tape ARchive" (Unix)
- TAU "Text Archive Utility" (CLM)
- TAZ compressed TAR file (Unix)
- TBH "Turbo Basic Help" (Borland)
- TBK "dbT BacKup" (AT dBASE3+)
- TBL "TaBLe"
- TC "Turbo C" related (Borland)
- TCH "Turbo C Help"
- TD "Text Driver" (Lotus Manuscript)
- TDH "Turbo Debugger Help" (Borland)
- TDO "To Do" list
- TEL "TELephone"
- THD message "THreaD"
- THS "THeSaurus" (Word Perfect v5)
- TIF "Tag Image File" format (TIFF)
- TLB "Text LiBrary" (VAX VMS)
- TMK "TapMarK" (msg thread mgr for TAPCIS)
- TMP "TeMPorary" file, usually discardable
- TOC "Table Of Contents"
- TOK "TOKen" (?)
- TP "Turbo Pascal" options (Borland)
- TPL "Turbo Pascal v4+ Library"
- TPM "Turbo Pascal v4+ Map"
- TPU "Turbo Pascal v4+ Unit"
- TPX "TaPleX" (TAPCIS accessory) version file
- TRC "TRaCe" (?)
- TRM "TeRMinal" info
- TRN "TRaNslation" (Borland Quattro)
- TRX (Prodigy)
- TSP Pagemaker-related (Aldus)
- TST "TeST"
- TTL "TiTLe" or "TuToriaL"
- TTX (Prodigy)
- TUT "TUTorial"
- TXT "TeXT"
- UG "User's Guide"
- UI "User Interface" (Borland Sprint)
- UPD "UPDate" info
- UPG "UPGrade" info
- USL "US font Landscape"
- USP "US font Portrait"
- USR "USeR"
- UTL "UTiLity" (Quicksilver)
- VAL "VALues" (Lotus Manuscript)
- VAR "VARiables" (usually, an include file)
- VER "VERsion" info
- VFN "Vector FoNt" (Lotus Freelance)
- VGA "VGA font file" (Ventura Publisher)
- VGR "Ventura GRaphic" (Ventura Publisher)
- VIR "VIRus" info
- VOL (Fastback plus related ?)
- VMS VAX VMS ("Virtual Memory System") related
- VSM "Vector SyMbol" (PC Paint)
- VUE "VIEW" (AT dBASE)
- WDX "WorDiX" formatter
- WID "character WIDth table" (Ventura Publisher)
- WIN "WINdow" (Quicksilver)
- WK! squeezed WK1 file (Quattro convention)
- WK$ squeezed WKS file (Quattro convention)
- WK1 "WorKsheet 123" (Lotus v2)
- WKE "WorKsheet Educational" (Lotus)
- WKQ "WorKsheet Quattro" (Borland)
- WKS "WorKSheet" (Lotus 123 v1)
- WKZ squeezed WKQ file (Quattro)
- WMF some sort of graphic
- WP "WordPerfect" file (or generic "Word Processor")
- WPG "WordPerfect Graphics" (?)
- WPM "WordPerfect Macro"
- WPF Enable-related
- WR1 Symphony-related (Lotus)
- WRI "WRIte" (MS Windows)
- WRK "WoRK"
- WS "WordStar" document (Micropro)
- WS? "WordStar version ?" -related (Micropro)
- X?? (Paradox)
- XCL Wordstar-related (Micropro)
- XLT "TRANSLaTe" (Lotus v2, et al.)
- XQT Supercalc "eXeCUTable"
- XRF Cross-Reference file (various compilers)
- XT? "CROSSTalk"-related
- XTC \
- XTD \
- XTF \
- XTH \ CrossTalk files (XTalk)
- XTK /
- XTP /
- XTS /
- XTT /
- XWP Xerox Writer document
- XXX (possibly, an obsolete file)
- Y?? (Paradox)
- Z compressed file (Unix)
- Z80 "Z80" assembly source (CP/M)
- ZIP special file compression/archive (PKware)
- ZOO special file compression/archive (Dhesi)
- ~~~ Send updates/submissions to J. W. Rider [72426,1640]