Undocumented File Formats
These 87 formats are known to the catalog, but Wotsup.org currently has no detailed format notes, no preserved local specification, and no active external reference for them.
This is a research backlog, not a claim that no documentation exists anywhere. A specification may survive in an old SDK, book, source repository, standards archive, magazine, disk image, or personal collection.
If you can identify or recover a source, open a missing-specification issue or contribute it directly.
| Extension | Known meaning | Categories | What is missing |
|---|---|---|---|
.arc |
ARC/PAK File Format | archive | Missing archived file |
.comms |
Adobe Serial and Parallel Communications Protocols Specification | hardware-formats | Missing archived file |
.compress |
MS Compress 5.0 File Format (Incomplete) +1 more meaning | archive | No source material recorded |
.cpi |
DOS CPI Fonts | fonts | Missing archived file |
.cws |
MgForex/ForexNews Charts workspace (*.CWS) and single charts (*.CHA) | financial | Missing archived file |
.dore |
Dore raster file format | 2d-graphics | Missing archived file |
.dot |
CCD Astrocamera format DOT for CCDDOTV Software | 2d-graphics | Missing archived file |
.drs |
Drawperfect 1.0 fonts | fonts | Missing archived file |
.dtm |
DigiTrekker Module Format | audio | Missing archived file |
.dwc |
DWC File Format (corrected) | archive | Missing archived file |
.dwd |
DiamondWare's Sound ToolKit DWD format | audio | Missing archived file |
.ecw |
Waveset File Specification v1.21 | audio | Missing archived file |
.esc |
Epson 9 and 24 Pin Printer Control Codes | printer-formats | No source material recorded |
.intel-mmx |
Intel MMX Instructions also extra Cyrix extensions | hardware-formats | Missing archived file |
.lanalyzer |
LANalyzer for Windows trace file format | misc | Missing archived file |
.mix |
MIX file id calculation function (Command and Conquer) | game-files | Missing archived file |
.mld |
Multilizer Dictionary File Format v1.1 | misc | Missing archived file |
.mod |
MOD Player Tutorial by FireLight +4 more meanings | audio | 5 missing archived files |
.mol |
Chemical table files (Ctfiles, MOL, etc.) | misc | Missing archived file |
.mouse |
AST IR mouse with C and a CC class examples for Linux +2 more meanings | hardware-formats | 3 missing archived files |
.mp |
Module Protector format | audio | Missing archived file |
.mp3 |
Maplay 1.2 source (32-bit C++) +4 more meanings | audio | 5 missing archived files |
.mpq |
Blizzard MoPaQ Archive Format v1.0 | archivegame-files | Missing archived file |
.mpw |
MosASCII Project Workspace/File Format (MPW/MPF) 1.0B | 2d-graphics | Missing archived file |
.msk |
Autodesk Animator Mask File Format | 2d-graphics | Missing archived file |
.mt2 |
MadTracker 2.0 Module Format | audio | Missing archived file |
.mtm |
MultiTracker Module format | audio | Missing archived file |
.mtr |
Master Tracker Module format | audio | Missing archived file |
.mus |
Electronic Arts New Audio File Formats +1 more meaning | audiogame-files | 2 missing archived files |
.mve |
Interplay MVE file format + Code | game-filesvideo-animation | Missing archived file |
.pgp |
OpenPGP Message Format (PGP 5x) +1 more meaning | misc | 2 missing archived files |
.phapack |
PhaPacker format (also called ProPacker V1.0 by NoiseConverter & Exotic Ripper also called HanniPacker and/or StrangePlayer) | audio | Missing archived file |
.pic |
Autodesk Animator PIC/CEL File Format +3 more meanings | 2d-graphics | 4 missing archived files |
.pif |
Program Information File Format | binaries | Missing archived file |
.pig |
Descent and Descent 2 Sound Effects Formats +1 more meaning | audiogame-files | 2 missing archived files |
.pit |
Programming the Intel 8253 Programmable Interval Timer | hardware-formats | Missing archived file |
.pix |
Alias PIX File Format Information +1 more meaning | 2d-graphics | 2 missing archived files |
.pixar |
PIXAR Raster Picture files | 2d-graphics | Missing archived file |
.pk |
TeX/Metafont PK bitmap font format | fonts | Missing archived file |
.pkg |
QuickTime 5 Install/Archive Package Format | video-animation | Missing archived file |
.pkr |
The PKF Scripting Language (PKR/PKD File Format) | game-files | Missing archived file |
.pkt |
PKT mail file format | internet | Missing archived file |
.player |
The player 4.0 - 6.1 formats | audio | Missing archived file |
.plm |
Disorder Tracker 2 PLM/PLS file formats | audio | Missing archived file |
.pm |
Power Music format | audio | Missing archived file |
.pntg |
MacPaint File Format (Acrobat) | 2d-graphics | Missing archived file |
.pod |
Hellbender .POD file Format Document | game-files | Missing archived file |
.pol |
InnovMetric Binary File Format (Acrobat) | 3d-graphics | Missing archived file |
.pov |
Persistance of Vision Ray Tracer v3.0 | 3d-graphics | Missing archived file |
.pqa |
Palm File Format Specification (PQA,PRC,PDB) | misc | Missing archived file |
.promizer |
Promizer v0.1/v1.0c/v1.8a/v2.0/v4.0 formats (formely known as Avalon packer) | audio | Missing archived file |
.propacker |
ProPacker v1.0/v2.1/v3.0 formats | audio | Missing archived file |
.prorunner |
ProRunner v1/v2 formats | audio | Missing archived file |
.ps16 |
Protracker Studio 16 Format | audio | Missing archived file |
.psf |
The Palette Storage Format (PSF) (Incomplete) | 2d-graphics | Missing archived file |
.psid |
Sidtune file formats (Word) | audio | Missing archived file |
.psm |
Protracker Studio Module Format | audio | Missing archived file |
.psp |
Paint Shop Pro File Format Specification version 3 +2 more meanings | 2d-graphics | 3 missing archived files |
.ptm |
Polytracker Module Format v1.17 | audio | Missing archived file |
.rex |
Pharlap Relocatable Executables example code (Watcom C/C++ 10.6) | binaries | Missing archived file |
.rtm |
Real Tracker Module (.RTM) Format | audio | Missing archived file |
.rtttl |
Ringing Tone Text Transfer Language AKA NokRing | misc | Missing archived file |
.shp |
ArcView(R) Version 2 Shapefile Technical Description +1 more meaning | gis-formats | 2 missing archived files |
.sis |
Symbian OS SIS File Format | binaries | Missing archived file |
.skyt |
SKYT packer format | audio | Missing archived file |
.slb |
AutoCAD Slide Libraries (.SLB and .SLD) | 2d-graphicscad | Missing archived file |
.smb |
Microsoft Networks SMB file sharing protocol extensions Version 3.0 | misc | Missing archived file |
.smjpeg |
SDL Motion JPEG Library | video-animation | Missing archived file |
.sniffer |
Sniffer trace files | misc | Missing archived file |
.sod |
Storm3D Object Definition (SOD) File Format | 2d-graphics | Missing archived file |
.speaker |
Programming the PC Speaker | hardware-formats | Missing archived file |
.spectrum |
Spectrum Emulator File Formats | misc | Missing archived file |
.spr |
Pro Motion 4.2 .SPR animation format | video-animation | Missing archived file |
.sqd |
Squish message base files .SQD & .SQI | internet | Missing archived file |
.sqz |
SQZ Archive File Format | archive | Missing archived file |
.srec |
Motorola S-Records | misc | Missing archived file |
.sss |
Studio Session Song File Format | audio | Missing archived file |
.starpack |
StarTrekker pack format | audio | Missing archived file |
.stm |
Scream Tracker 1.0 File Format | audio | Missing archived file |
.stx |
Scream Tracker Music Interface Kit +1 more meaning | audiofinancial | 2 missing archived files |
.swd |
Settlers 2 (Gold Edition) Map Files | game-files | Missing archived file |
.swecoin |
SWF - Swecoin Font Format and PKT - Swecoin Packet Format for Kiosk applications | misc | Missing archived file |
.swg |
SWAG packet header info | misc | Missing archived file |
.td0 |
Teledisk File Format | archive | Missing archived file |
.twain |
TWAIN 1.8 Specification (Acrobat) | misc | Missing archived file |
.txf |
Tax Exchange Format | financial | Missing archived file |
.ult |
Mysterious's ULTRA TRACKER File Format | audio | Missing archived file |