| 1 | 1 | N/A | Unix Section 1 Manual Page |
| 2 | 89T | N/A | Generic |
| 3 | 92T | N/A | Generic |
| 4 | 9XT | N/A | Generic |
| 5 | AC | Inivis Limited | AC3D Geometry Format |
|
| 6 | ADL | BOC Information Technologies Consulting AG | ADONIS Models And Model Groups Export |
| 7 | AML | Microsoft | Microsoft Assistance Markup Language |
| 8 | ANDROID | N/A | Readme |
| 9 | ANNOT | Adobe Systems | Adobe Digital Editions Annotations Format |
| 10 | ANS | N/A | ANSI Text Format |
| 11 | ANSI | N/A | Mistaken TXT document |
| 12 | APPLICATION | Microsoft | ClickOnce Deployment Manifest Format |
| 13 | AQT | N/A | AQTitle Subtitles Format |
| 14 | ARFF | University of Waikato | Weka Attribute-relation Format |
| 15 | ASCII | N/A | ASCII Text Format |
| 16 | ASP | Microsoft | Active Server Page |
| 17 | ASS | N/A | Aegisub Advanced Substation Alpha Format |
| 18 | ATT | N/A | Web Form Data Format |
| 19 | BA1 | Microsoft Corporation | Microsoft Windows Media Center Report Log |
| 20 | BBS | N/A | Bulletin Board System Text |
| 21 | BCR | PVT AG | Map&guide Station List |
| 22 | BLM | N/A | Eurolink Comma Separated Value |
| 23 | BLN | Golden Software | Golden Software Blanking Format |
| 24 | BNA | Golden Software | Atlas Boundary Format |
| 25 | BNX | N/A | Board Neutral Exchange data |
| 26 | BRF | N/A | Braille Ready Format |
| 27 | BSDL | IEEE | Boundary Scan Description Language Format |
| 28 | BSS | Capcom | Resident Evil Background Images Format |
| 29 | CASCII | N/A | CACTVS Chemical ASCII Format |
| 30 | CHARSET | N/A | Character Set |
| 31 | CHORD | N/A | Song Chords Format |
| 32 | CLIPPING | Apple, Inc. | Apple Mac OS X Finder |
| 33 | CM0013 | Samsung | Samsung Smart TV Index File |
| 34 | COF | Autodesk | AutoDesk Data Format |
| 35 | CONF | N/A | Configuration Information Format |
| 36 | COO | Autodesk, Inc. | AutoCAD Bounding Coordinates Cookie |
| 37 | CRASH | Apple | Mac OS X Crash Log Format |
| 38 | CSASSEMBLY | ICQ LLC | ICQ 6 |
| 39 | CSMANIFEST | ICQ LLC | ICQ 6 Settings |
| 40 | CSV | N/A | Comma Separated Values Format |
| 41 | DBT | dBASE | Database Text Format |
| 42 | DE | DrawExpress | German Language Translation |
| 43 | DEA | N/A | Generic |
| 44 | DECTEST | N/A | Decimal test data |
| 45 | DES | Corel | Corel Designer Format |
| 46 | DESC | Electronic Arts | Battlefield 2 Map Description Format |
| 47 | DFE | RISCOS Ltd. | RISC OS Comma Separated Value |
| 48 | DISKDEFINES | N/A | Linux LiveCD Information Format |
| 49 | DIZ | N/A | Description In Zip Format |
| 50 | DKZ | N/A | ZIP Description Text |
| 51 | DOK | SoftwareOK | ASCII Text |
| 52 | DQY | Microsoft | Excel Query Format |
| 53 | DRP | Blackmagic Design | DaVinci Resolve Project |
| 54 | DSML | N/A | Directory Services Markup Language (DSML) Identity Feed |
| 55 | ECSV | N/A | Encapsulated Comma Separated Value |
| 56 | EDML | Adobe Systems | Adobe Extension Data Markup Language Document |
| 57 | EIA | N/A | Excellon |
| 58 | EMULECOLLECTION | eMule | EMule Data Format |
| 59 | EN | N/A | Generic |
| 60 | ERR | N/A | Error Log Format |
| 61 | ETX | N/A | Setext Structure Enhanced Text Format |
| 62 | EXTRA | Mozilla | Mozilla Firefox Crash Report Format |
| 63 | FAQ | N/A | Frequently Asked Questions Document |
| 64 | FFP | N/A | FLAC Fingerprint |
| 65 | FIRST | N/A | Formatted Text |
| 66 | FPT | FileMaker | FileMaker Pro Database Memo Format |
| 67 | FR | N/A | French Language Translation |
| 68 | FSA | Applied Biosystems | FASTA DNA And Protein Sequence Alignment |
| 69 | GER | N/A | German Text/html Info |
| 70 | GNU | N/A | Generic |
| 71 | HHC | Microsoft | HTML Help Table Of Contents |
| 72 | HTM | N/A | Hypertext Markup Language Format |
| 73 | HTML | WHATWG | Hypertext Markup Language Format |
| 74 | HTML5 | N/A | HTML5 Hypertext Markup Language Revision 5 Source |
| 75 | HTMLS | N/A | HyperText Markup Language Document With Server-side Include |
| 76 | HVC | HotDocs | ASCII Format |
| 77 | ID31 | Intermedia Software | Helium Music Manager Id3 Tags Export |
| 78 | ID32 | Intermedia Software | Helium Music Manager Id3 Tags Export |
| 79 | IDT | Microsoft | Windows Installer Database Text Archive Format |
| 80 | IGY | Microsoft Corporation | Microsoft Excel Web Query |
| 81 | INUSE | N/A | Text Configuration Format (in Use) |
| 82 | ION | N/A | File Description Format |
| 83 | JA | N3V Games | Jet Archive |
| 84 | JEB | N/A | PENSIM Output |
| 85 | JIS | N/A | Japanese Industry Standard Text |
| 86 | JP1 | N/A | Japanese (Romaji) Text Format |
| 87 | JTX | Microsoft | ESE Transaction Log |
| 88 | KAR | N/A | Karaoke MIDI Format |
| 89 | KIX | KiXtart | KiXtart Script Format |
| 90 | KLG | N/A | Log Format |
| 91 | KOR | Microsoft | Windows Korean Noise-Words List Format |
| 92 | LAS | ASPRS | LIDAR Data Exchange Format |
| 93 | LDF | Microsoft | SQL Server Transaction Log Format |
| 94 | LINUX | Various Linux developers | Linux |
| 95 | LISP | N/A | Lisp Source Code Format |
| 96 | LNC | Sports Interactive | Football Manager Player |
| 97 | LOG | N/A | Log Format |
| 98 | LRC | N/A | Lyrics Format |
| 99 | LST | N/A | Data List |
| 100 | LTR | N/A | Letter Format |
| 101 | LTT | N/A | HP Library And Tape Tools Log |
| 102 | LUE | Symantec | Norton LiveUpdate Log Format |
| 103 | LXFML | LEGO | LEGO Digital Designer XML Format |
| 104 | MANIFEST | Microsoft | Windows Application Manifest Format |
| 105 | MARKDOWN | John Gruber | Markdown Documentation Format |
| 106 | MATHML | N/A | Mathematical Markup Language |
| 107 | MAXFR | N/A | Generic |
| 108 | MD | John Gruber | Markdown Documentation Format |
| 109 | MDLE | N/A | Motion Description Language Extended |
| 110 | MDOWN | John Gruber | Markdown Format |
| 111 | MDTEXT | John Gruber | Markdown Markup Language |
| 112 | MDTXT | John Gruber | Markdown Markup Language |
| 113 | MDWN | John Gruber | Markdown Markup Language |
| 114 | MF | Sun Microsystems | Java Manifest Format |
| 115 | MIT | MineEdit | MineEdit Inventory Template Format |
| 116 | MKDN | John Gruber | Markdown Markup Language |
| 117 | MW | Maplesoft | Maple Worksheet |
| 118 | NCLK | N/A | HTML Formatted Text |
| 119 | NEW | Google | Ameco Embroidery Format |
| 120 | NFO | THG | Warez Information Format |
| 121 | NNA | N/A | NeuralWare data |
| 122 | NOKOGIRI | Nokogiri Team | Nokogiri Source |
| 123 | NOT | Notation Software | Notation Format |
| 124 | NOW | N/A | Readme Format |
| 125 | NPDT | N/A | Mac Text |
| 126 | NT | Microsoft | Windows NT Startup Format |
| 127 | NWCTXT | NoteWorthy | NoteWorthy Composer Text Format |
| 128 | OCR | Nuance Communications | FAXGrapper Fax Text Format |
| 129 | OMN | N/A | Omnipotent Collection |
| 130 | OOGL | Geometry Center at the University of Minnesota | Geomview Object Oriented Graphics Library |
| 131 | OOT | OpenOffice Project Team | OpenOffice.org Text |
| 132 | OPENBSD | N/A | OpenBSD Readme Format |
| 133 | OPML | The Omni Group | Outline Processor Markup Language Format |
| 134 | ORT | IBM | COREX Orthographic Transcriptions Format |
| 135 | OSN | N/A | Open Symbolic Notation data |
| 136 | P3X | N/A | Document |
| 137 | PANIC | N/A | Kernel Panic Format |
| 138 | PCL | HP | Printer Command Language Document |
| 139 | PDU | LG Electronics | Protocol Data Unit Message |
| 140 | PGW | N/A | Map Data |
| 141 | PJS | Phoenix Japanimation Society | Phoenix Subtitles Format |
| 142 | PLIST | Apple | Mac OS X Property List Format |
| 143 | POD | Terminal Reality | Perl POD Format |
| 144 | PVJ | K-Flow | ProofVision Job Ticket |
| 145 | QDT | Quark, Inc. | QuarkXpress Auxiliary Dictionary Format |
| 146 | QUD | Quark, Inc. | QuarkXpress Auxiliary Dictionary |
| 147 | RDF | N/A | Resource Description Framework Format |
| 148 | README | N/A | Readme Format |
| 149 | REG | Microsoft | Registry Format |
| 150 | REPORT | N/A | GENSCAN output results |
| 151 | RESP | Microsoft Corporation | Microsoft Windows Report Log |
| 152 | REST | N/A | ReStructuredText |
| 153 | RFF | N/A | Build Engine RFF encrypted container |
| 154 | RIS | Research Information Systems | Research Information Systems Citation Format |
| 155 | RML | Autodesk | Redline Markup Language Format |
| 156 | RT | RealNetworks | RealText Streaming Text Format |
| 157 | RTF | Microsoft | Rich Text Format |
| 158 | RU | N/A | Java Russian Font Properties Format |
| 159 | RUS | GPS Moldova | Navitel Navigator Map |
| 160 | RZN | Red Zion | Red Zion Notes Format |
| 161 | S19 | Motorola | Motorola S19 Format Record |
| 162 | S2K | N/A | Subtitle |
| 163 | SAMI | Sublime HQ Pty Ltd | Synchronized Accessible Media Interchange Format |
| 164 | SDNF | N/A | Steel Detailing Neutral Format |
| 165 | SFB | Sony | PlayStation 3 Disc Data Format |
| 166 | SHA1 | N/A | SHA-1 Hash Format |
| 167 | SHA512 | N/A | SHA 512 Hash Format |
| 168 | SMALI | Google | Android Smali Assembly Language Format |
| 169 | SMI | Apple | SMIL Presentation |
| 170 | SNW | Prof. Friedrich Leisch | Sweave Source |
| 171 | SOAP | N/A | Simple Object Access Protocol Message (SOAP) Message |
| 172 | SOUNDSCRIPT | N/A | Rigs Of Rods Sound Script Description |
| 173 | SPEC | N/A | RPM Specification Format |
| 174 | SRT | N/A | SubRip Subtitle Format |
| 175 | SRX | N/A | SPARQL Query Results XML Format Result |
| 176 | SSA | Kotus | Sub Station Alpha Subtitle Format |
| 177 | STRINGS | Apple | Text Strings Format |
| 178 | SUB | Tiamat Software | Subtitle Format |
| 179 | TBL | Blizzard Entertainment | Table Format |
| 180 | TCM | IMSI | TurboCAD Mac Drawing |
| 181 | TDUMP | N/A | Java HotSpot Thread Dump |
| 182 | TEXT | N/A | Plain Text Format |
| 183 | TEXTCLIPPING | Apple | Mac OS X Text Clipping Format |
| 184 | TEXTILE | The Eclipse Foundation | Eclipse IDE WikiText Document |
| 185 | TFW | ESRI | World Format For TIFF |
| 186 | TLX | N/A | Standard Dictionary Format |
| 187 | TNEF | Microsoft | Transport Neutral Encapsulation Format |
| 188 | TSV | N/A | Tab Separated Values Format |
| 189 | TT | Microsoft | Visual Studio Text Template |
| 190 | TX8 | N/A | 8-bit DOS ASCII Text |
| 191 | TXE | N/A | Enriched Text |
| 192 | TXH | Bram Moolenaar | Light Markup Language Text |
| 193 | TXT | N/A | Plain Text Format |
| 194 | UK | N/A | English (British) Language Translation |
| 195 | UNX | N/A | Unix Text Format |
| 196 | US | N/A | English Language Translation |
| 197 | USER | Microsoft | Visual Studio Project User Options Format |
| 198 | USF | EVGA | Nintendo 64 Music Format |
| 199 | UTF8 | N/A | Unicode UTF8-Encoded Text Document |
| 200 | V2T | N/A | Generic |
| 201 | VER | N/A | Version Record |
| 202 | VERS | N/A | Version description data |
| 203 | VFK | N/A | Generic |
| 204 | VMG | Nokia | Nokia Text Message |
| 205 | VXML | N/A | VoiceXML Format |
| 206 | WER | Microsoft | Windows Error Report |
| 207 | WRL | N/A | VRML World |
| 208 | WSH | Microsoft | Windows Script Host Settings |
| 209 | WTX | N/A | Text Document |
| 210 | XDP | Adobe Systems | XML Data Package |
| 211 | XFD | UWI | XFD Format |
| 212 | XHTM | N/A | Extensible Hypertext Markup Language Document |
| 213 | XLF | OASIS | XLIFF Document |
| 214 | XLOG | Tencent | WeChat Log File |
| 215 | XML | World Wide Web Consortium | XML Format |
| 216 | XMP | Adobe Systems | Extensible Metadata Platform Format |
| 217 | XSD | N/A | XML Schema Definition |
| 218 | XSL | N/A | Microsoft SharePoint WorkSpace Groove Database Format |
| 219 | XSLT | N/A | XSL Transformation Format |
| 220 | YML | N/A | YAML Document |
| 221 | _ME | N/A | Read Me |
