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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .A | Open Source | Developer Files | Static Library | Apple TextEdit | Apple |
| .AAE | Apple | Data Files | Sidecar Image Format File | Apple TextEdit | Apple |
| .AD2 | Unknown Developer | Audio Files | ADPCM 2-bit Compressed Voice | Apple TextEdit | Apple |
| .ADOC | Stuart Rackham | 3D Image Files | AsciiDoc File | Apple TextEdit | Apple |
| .ANDROID | Unknown Developer | Data Files | Android Readme File | Apple TextEdit | Apple |
| .AS | Adobe Systems Incorporated | Developer Files | Adobe ActionScript File | Apple TextEdit | Apple |
| .ASC | Symantec Corporation | Encoded Files | PGP (Pretty Good Privacy) ASCII Armored File | Apple TextEdit | Apple |
| .ASCII | Sublime HQ Pty Ltd | Text Files | ASCII Text | Apple TextEdit | Apple |
| .AWK | Free Software Foundation | Developer Files | AWK Script | Apple TextEdit | Apple |
| .B | Rockstar Games | Game Files | Grand Theft Auto 3 Saved Game File | Apple TextEdit | Apple |
| .BCS | The Wavelength | Settings Files | Batch Compiler Specification File | Apple TextEdit | Apple |
| .BI | Microsoft Corporation | Data Files | Binary File | Apple TextEdit | Apple |
| .BLG | Microsoft Corporation | Data Files | Windows Binary Performance Log File | Apple TextEdit | Apple |
| .BMK | return7, LLC | Backup Files | BillMinder Backup File | Apple TextEdit | Apple |
| .BML | Various Developers | Web Files | Bean Markup Language File | Apple TextEdit | Apple |
| .BWP | Fluffy Smoke Entertainment | Web Files | BuRg3r Web Page | Apple TextEdit | Apple |
| .CEL | Affymetrix | Data Files | Affymetrix Probe Results File | Apple TextEdit | Apple |
| .CELX | Open Source | Executable Files | Celestia Script File | Apple TextEdit | Apple |
| .CF | Proofpoint, Inc. | Settings Files | Sendmail Configuration File | Apple TextEdit | Apple |
| .CFG | Unknown Developer | Developer Files | Configuration File | Apple TextEdit | Apple |
| .CHARSET | Sublime HQ Pty Ltd | Text Files | Character Set | Apple TextEdit | Apple |
| .CHORD | Open Source | Text Files | Song Chords File | Apple TextEdit | Apple |
| .CIK | Corel | Settings Files | Corel Graphics 10 Custom Dual Tone File | Apple TextEdit | Apple |
| .CIL | Symantec Corporation | Data Files | Norton CleanSweep Installation Log File | Apple TextEdit | Apple |
| .CML | Unknown Developer | Data Files | Chemical Markup Language File | Apple TextEdit | Apple |
| .CONF | Unknown Developer | Settings Files | Generic Configuration File | Apple TextEdit | Apple |
| .CONFIG | Unknown Developer | Developer Files | Configuration File | Apple TextEdit | Apple |
| .CPQ | Compaq | System Files | Compaq OEM Disc Configuration File | Apple TextEdit | Apple |
| .CRASH | Apple | System Files | Mac OS X Crash Log File | Apple TextEdit | Apple |
| .DB-JOURNAL | Sublime HQ Pty Ltd | Database Files | SQLite Rollback Journal File | Apple TextEdit | Apple |
| .DBP | Microsoft Corporation | Developer Files | Microsoft Visual Studio Visual C++ Database Project | Apple TextEdit | Apple |
| .DEC | Various Developers | Developer Files | Declaration File | Apple TextEdit | Apple |
| .DIZ | Unknown Developer | Text Files | Description In Zip File | Apple TextEdit | Apple |
| .DOK | Nenad Hrg | Settings Files | DesktopOK Icons Layout File | Apple TextEdit | Apple |
| .DSC | Kingsoft | Settings Files | Kingsoft Design Science Equation File | Apple TextEdit | Apple |
| .DTD | Syncro Soft | Developer Files | Document Type Definition File | Apple TextEdit | Apple |
| .ERB | Open Source | Developer Files | Ruby ERB Script | Apple TextEdit | Apple |
| .ERR | Microsoft Corporation | Text Files | Error Log File | Apple TextEdit | Apple |
| .ES | Interscape | Audio Files | ECHOSPEECH File | Apple TextEdit | Apple |
| .EXT | Symantec Corporation | Plugin Files | Norton Commander Extension | Apple TextEdit | Apple |
| .FSSCRIPT | Microsoft Corporation | Developer Files | Visual F# Script File | Apple TextEdit | Apple |
| .FSX | Microsoft Corporation | Developer Files | Visual F# Script File | Apple TextEdit | Apple |
| .GPL | Open Source | Text Files | GNU Public License Text File | Apple TextEdit | Apple |
| .HAML | Sublime HQ Pty Ltd | Developer Files | HTML Abstraction Markup Language File | Apple TextEdit | Apple |
| .HDT | Adobe Systems Incorporated | Settings Files | Photoshop HDR Toning Preset File | Apple TextEdit | Apple |
| .HRL | Ericsson Computer Science Laboratory | Developer Files | Erlang Header File | Apple TextEdit | Apple |
| .HSK | Huskey Truss & Building Supply | Data Files | Huskey Truss & Building Supply Import File | Apple TextEdit | Apple |
| .HTML5 | Sublime HQ Pty Ltd | Developer Files | HTML5 Hypertext Markup Language Revision 5 Source Code | Apple TextEdit | Apple |
| .HVC | Sublime HQ Pty Ltd | Text Files | ASCII Text | Apple TextEdit | Apple |
| .IIL | Symantec Corporation | Data Files | Norton CleanSweep Installation Log File | Apple TextEdit | Apple |
| .IL | Microsoft Corporation | Uncommon Files | MSIL Assembler Input File | Apple TextEdit | Apple |
| .INFO | GNU Project | Uncommon Files | Texinfo Document | Apple TextEdit | Apple |
| .ION | Open Source | System Files | File Description File | Apple TextEdit | Apple |
| .JAV | Oracle Corporation | Developer Files | Java Source Code | Apple TextEdit | Apple |
| .JAVA | Oracle Corporation | Developer Files | Java Source Code | Apple TextEdit | Apple |
| .JNLP | Oracle Corporation | Web Files | Java Web Start File | Apple TextEdit | Apple |
| .JS | NetScape | Web Files | JavaScript File | Apple TextEdit | Apple |
| .JSCRIPT | NetScape | Web Files | JavaScript File | Apple TextEdit | Apple |
| .JSON | Mozilla | Backup Files | Mozilla Firefox Bookmarks Backup | Apple TextEdit | Apple |
| .JWK | Douglas Crockford | Encrypted Files | JSON Web Key | Apple TextEdit | Apple |
| .KCL | Nintendo | Game Files | Mario Kart Collision File | Apple TextEdit | Apple |
| .KDS | Knyzhov Dmitry | Settings Files | KD Player Skin File | Apple TextEdit | Apple |
| .L | Johan Bontes | Data Files | Game Of Life File | Apple TextEdit | Apple |
| .LDS | GNU Project | Developer Files | Binutils LD Linker Script | Apple TextEdit | Apple |
| .LGE | Don Ho | Data Files | Log Data | Apple TextEdit | Apple |
| .LIS | SourceForge | Text Files | SQR (Structured Query Reporting) Output File | Apple TextEdit | Apple |
| .LIST | Open Source | Data Files | APT List File | Apple TextEdit | Apple |
| .LOG | Unknown Developer | Text Files | Log File | Apple TextEdit | Apple |
| .LOL | Apple | Developer Files | LOLCODE Source Code FIle | Apple TextEdit | Apple |
| .LST | Unknown Developer | Text Files | Data List | Apple TextEdit | Apple |
| .LYT | Adminsoft | Data Files | Adminsoft Document Layout File | Apple TextEdit | Apple |
| .M | MathWorks | Developer Files | MATLAB Source Code File | Apple TextEdit | Apple |
| .MAN | Unknown Developer | Text Files | Unix Manual | Apple TextEdit | Apple |
| .MANIFEST | Microsoft Corporation | System Files | Windows Application Manifest File | Apple TextEdit | Apple |
| .MARKDOWN | Various Developers | Developer Files | Markdown Documentation File | Apple TextEdit | Apple |
| .MD | Various Developers | Developer Files | Markdown Documentation File | Apple TextEdit | Apple |
| .MDBACKUP | Apple | Backup Files | iPhone Data Backup File | Apple TextEdit | Apple |
| .MDOWN | John Gruber | Text Files | Markdown Markup Language Source Code | Apple TextEdit | Apple |
| .ME | Unknown Developer | Uncommon Files | Temporary Delete Me File | Apple TextEdit | Apple |
| .MENU | id Software | Game Files | Quake 3 Engine Menu File | Apple TextEdit | Apple |
| .MF | Walt Disney Imagineering | Game Files | Gameplay Multifile | Apple TextEdit | Apple |
| .MNU | Autodesk, Inc. | Settings Files | AutoCAD Interface Layout File | Apple TextEdit | Apple |
| .MPS | IBM | Data Files | Mathematical Programming System File | Apple TextEdit | Apple |
| .MSL | Microsoft Corporation | Developer Files | Mapping Specification Language File | Apple TextEdit | Apple |
| .MXML | Adobe Systems Incorporated | Developer Files | Flex MXML Component | Apple TextEdit | Apple |
| .NFO | Microsoft Corporation | System Files | System Information File | Apple TextEdit | Apple |
| .NOW | The Document Foundation | Text Files | Readme Text Document File | Apple TextEdit | Apple |
| .OCR | URUWORKS | Uncommon Files | Subtitle Workshop OCR Script | Apple TextEdit | Apple |
| .ODT | Oracle Corporation | Text Files | OpenDocument Text Document | Apple TextEdit | Apple |
| .OUT | Open Source | Executable Files | Compiled Executable File | Apple TextEdit | Apple |
| .PAGE | Hybrid Server Pages Group | Web Files | HybridJava Web Page | Apple TextEdit | Apple |
| .PANIC | Open Source | System Files | Kernel Panic File | Apple TextEdit | Apple |
| .PDU | Unknown Developer | Text Files | Protocol Data Unit Message | Apple TextEdit | Apple |
| .PER | Microsoft Corporation | Game Files | Age Of Empires Personality File | Apple TextEdit | Apple |
| .PHL | Amazon | eBook Files | Kindle Popular Highlights File | Apple TextEdit | Apple |
| .PHP | Panic | Web Files | PHP Source Code File | Apple TextEdit | Apple |
| .PHTM | The Catalina Group | Web Files | PHP-Based Web Page | Apple TextEdit | Apple |
| .PID | Open Source | Uncommon Files | Process ID File | Apple TextEdit | Apple |
| .PKS | Oracle Corporation | Data Files | Oracle Package Spec File | Apple TextEdit | Apple |
| .PP | Geckonization | Data Files | Pocket Physics Sketch File | Apple TextEdit | Apple |
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