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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .IIL | Symantec Corporation | Data Files | Norton CleanSweep Installation Log File | Notepad++ | Don Ho |
| .IML | JetBrains | Developer Files | IntelliJ IDEA Module | Notepad++ | Don Ho |
| .IN | Bitplane | Data Files | SmartGENERATOR Template File | Notepad++ | Don Ho |
| .INF | Parametric Technology Corporation | Temporary Files | Pro/ENGINEER Temporary | Notepad++ | Don Ho |
| .INFO | GNU Project | Uncommon Files | Texinfo Document | Notepad++ | Don Ho |
| .INI | Microsoft Corporation | Settings Files | Windows Initialization File | Notepad++ | Don Ho |
| .INS | Open Source | Data Files | LaTeX Installer Script | Notepad++ | Don Ho |
| .ION | Open Source | System Files | File Description File | Notepad++ | Don Ho |
| .JNLP | Oracle Corporation | Web Files | Java Web Start File | Notepad++ | Don Ho |
| .JPN | Microsoft Corporation | System Files | Windows Japanese Noise-Word List File | Notepad++ | Don Ho |
| .JS | NetScape | Web Files | JavaScript File | Notepad++ | Don Ho |
| .JSCRIPT | NetScape | Web Files | JavaScript File | Notepad++ | Don Ho |
| .JSON | Mozilla | Backup Files | Mozilla Firefox Bookmarks Backup | Notepad++ | Don Ho |
| .JSPF | Oracle Corporation | Developer Files | Java Server Page Fragment | Notepad++ | Don Ho |
| .JWK | Douglas Crockford | Encrypted Files | JSON Web Key | Notepad++ | Don Ho |
| .KDS | Knyzhov Dmitry | Settings Files | KD Player Skin File | Notepad++ | Don Ho |
| .KIX | Ruud Van Velsen | Executable Files | KiXtart Script File | Notepad++ | Don Ho |
| .L | Johan Bontes | Data Files | Game Of Life File | Notepad++ | Don Ho |
| .LDS | GNU Project | Developer Files | Binutils LD Linker Script | Notepad++ | Don Ho |
| .LEGAL | DaveTech | Data Files | DaveTech Legal Document | Notepad++ | Don Ho |
| .LIS | SourceForge | Text Files | SQR (Structured Query Reporting) Output File | Notepad++ | Don Ho |
| .LIST | Open Source | Data Files | APT List File | Notepad++ | Don Ho |
| .LNT | Gimpel Software | Developer Files | PC-lint/FlexeLint Configuration File | Notepad++ | Don Ho |
| .LOG | Unknown Developer | Text Files | Log File | Notepad++ | Don Ho |
| .LOL | Apple | Developer Files | LOLCODE Source Code FIle | Notepad++ | Don Ho |
| .LST | Unknown Developer | Text Files | Data List | Notepad++ | Don Ho |
| .LTR | Sublime HQ Pty Ltd | Text Files | Letter Document | Notepad++ | Don Ho |
| .LTT | Hewlett-Packard | Data Files | HP Library And Tape Tools Log | Notepad++ | Don Ho |
| .LUA | Unknown Developer | Developer Files | Lua Source File | Notepad++ | Don Ho |
| .LYT | Adminsoft | Data Files | Adminsoft Document Layout File | Notepad++ | Don Ho |
| .M | MathWorks | Developer Files | MATLAB Source Code File | Notepad++ | Don Ho |
| .MAN | Unknown Developer | Text Files | Unix Manual | Notepad++ | Don Ho |
| .MDL | MathWorks | Data Files | MathWorks Simulink Model | Notepad++ | Don Ho |
| .ME | Unknown Developer | Uncommon Files | Temporary Delete Me File | Notepad++ | Don Ho |
| .MED | Rockwell Automation Inc. | Developer Files | RSView Development Project Archive | Notepad++ | Don Ho |
| .MEDLINE | National Library of Medicine | Data Files | MEDLINE Document | Notepad++ | Don Ho |
| .MIB | Milenix Software Ltd. | Backup Files | MyInfo Topic Backup | Notepad++ | Don Ho |
| .ML | Robin Milner | Developer Files | ML Source Code File | Notepad++ | Don Ho |
| .MMT | Open Source | Compressed Files | Nimbus 7 SAMS Data File | Notepad++ | Don Ho |
| .MODULE | Open Source | Plugin Files | Drupal Module File | Notepad++ | Don Ho |
| .MSH1XML | Microsoft Corporation | Settings Files | Monad Display Configuration File | Notepad++ | Don Ho |
| .MSL | Microsoft Corporation | Developer Files | Mapping Specification Language File | Notepad++ | Don Ho |
| .MXML | Adobe Systems Incorporated | Developer Files | Flex MXML Component | Notepad++ | Don Ho |
| .N3 | Sublime HQ Pty Ltd | Text Files | Notation3 Document | Notepad++ | Don Ho |
| .NFO | Microsoft Corporation | System Files | System Information File | Notepad++ | Don Ho |
| .NNA | NeuralWare | Developer Files | NeuralWare Data | Notepad++ | Don Ho |
| .NOW | The Document Foundation | Text Files | Readme Text Document File | Notepad++ | Don Ho |
| .OCR | URUWORKS | Uncommon Files | Subtitle Workshop OCR Script | Notepad++ | Don Ho |
| .ODF | Oracle Corporation | Uncommon Files | OpenDocument Formula | Notepad++ | Don Ho |
| .OOA | Sublime HQ Pty Ltd | Data Files | OOA Interchange Format Data | Notepad++ | Don Ho |
| .PAGE | Hybrid Server Pages Group | Web Files | HybridJava Web Page | Notepad++ | Don Ho |
| .PANIC | Open Source | System Files | Kernel Panic File | Notepad++ | Don Ho |
| .PAS | Embarcadero Technologies | Developer Files | Delphi Unit Source File | Notepad++ | Don Ho |
| .PCC | Electronic Arts | Game Files | Mass Effect Package | Notepad++ | Don Ho |
| .PER | Microsoft Corporation | Game Files | Age Of Empires Personality File | Notepad++ | Don Ho |
| .PHL | Amazon | eBook Files | Kindle Popular Highlights File | Notepad++ | Don Ho |
| .PHP | Panic | Web Files | PHP Source Code File | Notepad++ | Don Ho |
| .PHTM | The Catalina Group | Web Files | PHP-Based Web Page | Notepad++ | Don Ho |
| .PKB | Oracle Corporation | Developer Files | Oracle Package Body File | Notepad++ | Don Ho |
| .PKS | Oracle Corporation | Data Files | Oracle Package Spec File | Notepad++ | Don Ho |
| .PLIST | Apple | Settings Files | Property List XML File | Notepad++ | Don Ho |
| .PO | Sublime HQ Pty Ltd | Developer Files | Portable Object | Notepad++ | Don Ho |
| .POT | Microsoft Corporation | Data Files | PowerPoint Template | Notepad++ | Don Ho |
| .PRG | Open Source | Executable Files | Program File | Notepad++ | Don Ho |
| .PSP | Corel Corporation | Raster Image Files | PaintShop Pro Image | Notepad++ | Don Ho |
| .PY | Python Software Foundation | Developer Files | Python Script | Notepad++ | Don Ho |
| .PY2 | Python Software Foundation | Developer Files | Python Script | Notepad++ | Don Ho |
| .RAT | World Wide Web Consortium (W3C) | Uncommon Files | PICS Rating File | Notepad++ | Don Ho |
| .RCJ | Microsoft Corporation | Text Files | Robocopy Job File | Notepad++ | Don Ho |
| .RDF | Unknown Developer | Settings Files | Resource Description Framework File | Notepad++ | Don Ho |
| .README | The Document Foundation | Text Files | Readme Text Document File | Notepad++ | Don Ho |
| .REPORT | Sublime HQ Pty Ltd | Data Files | Report File | Notepad++ | Don Ho |
| .RJS | Yukihiro “Matz” Matsumoto | Web Files | Ruby Javascript File | Notepad++ | Don Ho |
| .RPT | SAP | Data Files | Crystal Reports File | Notepad++ | Don Ho |
| .RPY | Team Shanghai Alice | Game Files | Touhou Project Replay File | Notepad++ | Don Ho |
| .RTL | Hewlett-Packard | Raster Image Files | Raster Transfer Language File | Notepad++ | Don Ho |
| .RTX | The Document Foundation | Text Files | Rich Text Document | Notepad++ | Don Ho |
| .RU | Microsoft Corporation | Text Files | Russian Text Or Localization File | Notepad++ | Don Ho |
| .S4P | Open Source | Data Files | Touchstone 16 S-parameters Data File | Notepad++ | Don Ho |
| .SAM | Microsoft Corporation | Text Files | LMHOSTS Sample File | Notepad++ | Don Ho |
| .SBV | Superbase Software | Page Layout Files | Superbase Form Definition File | Notepad++ | Don Ho |
| .SCA | Symantec Corporation | Data Files | Norton AntiVirus Scan File | Notepad++ | Don Ho |
| .SCRIPT | Unknown Developer | Executable Files | Generic Script File | Notepad++ | Don Ho |
| .SFB | Sony | Game Files | PlayStation 3 Disc Data File | Notepad++ | Don Ho |
| .SH | Unknown Developer | Developer Files | Bash Shell Script | Notepad++ | Don Ho |
| .SHT | The Document Foundation | Web Files | HTML File With Server Side Includes | Notepad++ | Don Ho |
| .SHTML | Sublime HQ Pty Ltd | Web Files | Server Side Include HTML File | Notepad++ | Don Ho |
| .SIF | Microsoft Corporation | Settings Files | Windows Setup Information File | Notepad++ | Don Ho |
| .SKI | Motorola | Settings Files | Motorola Phone Skin File | Notepad++ | Don Ho |
| .SL | SourceForge | Settings Files | Unix Software License File | Notepad++ | Don Ho |
| .SLS | Sublime HQ Pty Ltd | Uncommon Files | Image Playlist | Notepad++ | Don Ho |
| .SMS | Sega | Game Files | Sega Master System ROM | Notepad++ | Don Ho |
| .SMW | Crestron Electronics | Developer Files | SIMPL Windows Source File | Notepad++ | Don Ho |
| .SOUNDS | id Software | Game Files | Quake 3 Engine Sound Definition File | Notepad++ | Don Ho |
| .SPEC | Open Source | Developer Files | RPM Specification File | Notepad++ | Don Ho |
| .SPN | Corel | Settings Files | Corel WordPerfect Distribution Definition | Notepad++ | Don Ho |
| .SPS | IBM | Data Files | SPSS Program File | Notepad++ | Don Ho |
| .SRX | Sublime HQ Pty Ltd | Data Files | SPARQL Query Results XML Format Result | Notepad++ | Don Ho |
| .SS | Open Source | Developer Files | SilverStripe Source Code File | Notepad++ | Don Ho |
| .SSC | Microsoft Corporation | Developer Files | SourceSafe Status File | Notepad++ | Don Ho |
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