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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .1 | The Open Group | Uncommon Files | Unix Section 1 Man Page | GNU Emacs | GNU Project |
| .4TH | Open Source | Developer Files | Forth Language File | Gforth | GNU Project |
| .A | Open Source | Developer Files | Static Library | GNU Emacs | GNU Project |
| .AR | Microsoft Corporation | Game Files | Midtown Madness Data File | GNU Compiler Collection (GCC) | GNU Project |
| .ASM | Open Source | Developer Files | Assembly Language Source Code File | GNU Emacs | GNU Project |
| .ASPX | Microsoft Corporation | Web Files | Active Server Page Extended ASP.NET Script | GNU Emacs | GNU Project |
| .B | Rockstar Games | Game Files | Grand Theft Auto 3 Saved Game File | GNU Emacs | GNU Project |
| .CBL | IBM | Developer Files | COBOL Source Code File | GNU Compiler Collection (GCC) | GNU Project |
| .CC | Don Ho | Developer Files | C/C++ Source Code File | GNU Emacs | GNU Project |
| .CEL | Affymetrix | Data Files | Affymetrix Probe Results File | GNU Emacs | GNU Project |
| .CELX | Open Source | Executable Files | Celestia Script File | GNU Emacs | GNU Project |
| .CF | Proofpoint, Inc. | Settings Files | Sendmail Configuration File | GNU Emacs | GNU Project |
| .CFG | Unknown Developer | Developer Files | Configuration File | GNU Emacs | GNU Project |
| .COB | IBM | Developer Files | COBOL Source Code File | GNU Compiler Collection (GCC) | GNU Project |
| .CONF | Unknown Developer | Settings Files | Generic Configuration File | GNU Emacs | GNU Project |
| .CONFIG | Unknown Developer | Developer Files | Configuration File | GNU Emacs | GNU Project |
| .CPIO | Power Software Ltd | Encoded Files | Unix CPIO Archive | GNU Cpio | GNU Project |
| .CSHRC | The Open Group | Developer Files | Unix Command Data | GNU Emacs | GNU Project |
| .DBP | Microsoft Corporation | Developer Files | Microsoft Visual Studio Visual C++ Database Project | GNU Emacs | GNU Project |
| .EL | GNU Project | Developer Files | Emacs Lisp Code File | GNU Emacs | GNU Project |
| .ELC | GNU Project | Developer Files | Emacs Compiled Lisp File | GNU Emacs | GNU Project |
| .EPT | Adobe Systems Incorporated | Uncommon Files | Adobe Encapsulated PostScript Interchange Format With TIFF Preview | GNU Emacs | GNU Project |
| .ERR | Microsoft Corporation | Text Files | Error Log File | GNU Emacs | GNU Project |
| .ETF | NetScape | Text Files | Enriched Text Format E-mail Message | GNU Emacs | GNU Project |
| .EW | OpenEuphoria | Developer Files | Euphoria Source Code File | GNU Emacs | GNU Project |
| .EX | Symantec Corporation | Settings Files | Norton Ghost Template Data | GNU Emacs | GNU Project |
| .EXW | OpenEuphoria | Developer Files | Euphoria Source Code File | GNU Emacs | GNU Project |
| .FAQ | The Document Foundation | 3D Image Files | Frequently Asked Questions Document | GNU Emacs | GNU Project |
| .FI | Microsoft Corporation | Settings Files | Fortran Interface Data | Gforth | GNU Project |
| .FSSCRIPT | Microsoft Corporation | Developer Files | Visual F# Script File | GNU Emacs | GNU Project |
| .FSX | Microsoft Corporation | Developer Files | Visual F# Script File | GNU Emacs | GNU Project |
| .GPG | Free Software Foundation | Uncommon Files | GNU Privacy Guard Public Keyring | GNU Privacy Guard | GNU Project |
| .GZ | GNU Project | Compressed Files | Gnu Zipped Archive | Gzip | GNU Project |
| .H | The Eclipse Foundation | Developer Files | C/C++/Objective-C Header File | GNU Emacs | GNU Project |
| .HS | Open Source | Developer Files | Haskell Script | GNU Emacs | GNU Project |
| .HXX | The Qt Company | Developer Files | C++ Source Code Header File | GNU Compiler Collection (GCC) | GNU Project |
| .INC | Microsoft Corporation | Developer Files | Include File | GNU Emacs | GNU Project |
| .INFO | GNU Project | Uncommon Files | Texinfo Document | GNU Emacs | GNU Project |
| .JAV | Oracle Corporation | Developer Files | Java Source Code | GNU Emacs | GNU Project |
| .JAVA | Oracle Corporation | Developer Files | Java Source Code | GNU Emacs | GNU Project |
| .JNLP | Oracle Corporation | Web Files | Java Web Start File | GNU Emacs | GNU Project |
| .JSON | Mozilla | Backup Files | Mozilla Firefox Bookmarks Backup | GNU Emacs | GNU Project |
| .JWK | Douglas Crockford | Encrypted Files | JSON Web Key | GNU Emacs | GNU Project |
| .KBX | GNU Project | Data Files | GNU Privacy Guard Keybox File | GNU Privacy Guard | GNU Project |
| .KDS | Knyzhov Dmitry | Settings Files | KD Player Skin File | GNU Emacs | GNU Project |
| .L | Johan Bontes | Data Files | Game Of Life File | GNU Emacs | GNU Project |
| .LDS | GNU Project | Developer Files | Binutils LD Linker Script | GNU Binutils | GNU Project |
| .LOL | Apple | Developer Files | LOLCODE Source Code FIle | GNU Emacs | GNU Project |
| .LPD | GNU Project | System Files | LPD Daemon Print Permissions File | GNU Emacs | GNU Project |
| .LUA | Unknown Developer | Developer Files | Lua Source File | GNU Emacs | GNU Project |
| .LY | GNU Operating System | Data Files | LilyPond File | LilyPond | GNU Project |
| .MAN | Unknown Developer | Text Files | Unix Manual | GNU Emacs | GNU Project |
| .MARKDOWN | Various Developers | Developer Files | Markdown Documentation File | GNU Emacs | GNU Project |
| .MD | Various Developers | Developer Files | Markdown Documentation File | GNU Emacs | GNU Project |
| .MENU | id Software | Game Files | Quake 3 Engine Menu File | GNU Emacs | GNU Project |
| .ML | Robin Milner | Developer Files | ML Source Code File | GNU Emacs | GNU Project |
| .MPS | IBM | Data Files | Mathematical Programming System File | GNU Emacs | GNU Project |
| .O | Microsoft Corporation | Developer Files | Compiled Object File | GNU Compiler Collection (GCC) | GNU Project |
| .PHL | Amazon | eBook Files | Kindle Popular Highlights File | GNU Emacs | GNU Project |
| .PHP | Panic | Web Files | PHP Source Code File | GNU Emacs | GNU Project |
| .PY | Python Software Foundation | Developer Files | Python Script | GNU Emacs | GNU Project |
| .PY2 | Python Software Foundation | Developer Files | Python Script | GNU Emacs | GNU Project |
| .RPY | Team Shanghai Alice | Game Files | Touhou Project Replay File | GNU Emacs | GNU Project |
| .S | Unknown Developer | Developer Files | Source Code File | GNU Emacs | GNU Project |
| .SCHEMAS | Open Source | System Files | GConf Schema Definition File | GNU Emacs | GNU Project |
| .SIGN | Free Software Foundation | Encoded Files | GNU Privacy Guard Data | GNU Privacy Guard | GNU Project |
| .SKI | Motorola | Settings Files | Motorola Phone Skin File | GNU Emacs | GNU Project |
| .SLY | GNU Project | Audio Files | Lilypond Guitar File | LilyPond | GNU Project |
| .SMA | Don Ho | Developer Files | C/C++ Source Code File | GNU Emacs | GNU Project |
| .SO | GNU Project | Developer Files | Shared Library | GNU Compiler Collection (GCC) | GNU Project |
| .SRC | Unknown Developer | Developer Files | Source Code File | GNU Emacs | GNU Project |
| .TEXI | GNU Project | Data Files | TEXinfo File Format | TexInfo | GNU Project |
| .TLD | The Eclipse Foundation | Developer Files | Tag Library Descriptor File | GNU Emacs | GNU Project |
| .TRI | Singular Inversions | 3D Image Files | FaceGen Polygonal Model File | GNU Emacs | GNU Project |
| .VB | Microsoft Corporation | Developer Files | Visual Basic Project Item File | GNU Emacs | GNU Project |
| .VXML | Voxeo Corporation | Data Files | VoiceXML File | GNU Emacs | GNU Project |
| .Y | Microsoft Corporation | Raster Image Files | Subsampled Raw YUV Image | GNU Emacs | GNU Project |
| .Z | Smith Micro Software | Compressed Files | Unix Compressed File | Gzip | GNU Project |
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