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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .ADOC | Stuart Rackham | 3D Image Files | AsciiDoc File | Notepad2 | Open Source |
| .ALE | Avid Technology | Video Files | Avid Log Exchange File | Notepad2 | Open Source |
| .ANS | Open Source | Text Files | ANSI Text File | Notepad2 | Open Source |
| .ASC | Symantec Corporation | Encoded Files | PGP (Pretty Good Privacy) ASCII Armored File | Notepad2 | Open Source |
| .ASCII | Sublime HQ Pty Ltd | Text Files | ASCII Text | Notepad2 | Open Source |
| .ASE | Adobe Systems Incorporated | Settings Files | Adobe Swatch Exchange File | Notepad2 | Open Source |
| .ASHX | Microsoft Corporation | Web Files | ASP.NET Web Handler File | Notepad2 | Open Source |
| .ATT | Unknown Developer | Web Files | Web Form Post Data File | Notepad2 | Open Source |
| .AXD | Microsoft Corporation | Web Files | ASP.NET Web Handler File | Notepad2 | Open Source |
| .B | Rockstar Games | Game Files | Grand Theft Auto 3 Saved Game File | Notepad2 | Open Source |
| .BIB | Oren Patashnik | Text Files | BibTeX Bibliography Database | Notepad2 | Open Source |
| .BSD | IEEE Xplore | Data Files | Boundary Scan Description Language Data File | Notepad2 | Open Source |
| .CC2 | Briggs Softworks | Data Files | Calendar Commander Calendar Data | Notepad2 | Open Source |
| .CF | Proofpoint, Inc. | Settings Files | Sendmail Configuration File | Notepad2 | Open Source |
| .CFG | Unknown Developer | Developer Files | Configuration File | Notepad2 | Open Source |
| .CONFIG | Unknown Developer | Developer Files | Configuration File | Notepad2 | Open Source |
| .DIZ | Unknown Developer | Text Files | Description In Zip File | Notepad2 | Open Source |
| .DOK | Nenad Hrg | Settings Files | DesktopOK Icons Layout File | Notepad2 | Open Source |
| .DTD | Syncro Soft | Developer Files | Document Type Definition File | Notepad2 | Open Source |
| .DX | Digital Equipment Corporation | Text Files | DEC WPS Plus File | Notepad2 | Open Source |
| .ERB | Open Source | Developer Files | Ruby ERB Script | Notepad2 | Open Source |
| .FAQ | The Document Foundation | 3D Image Files | Frequently Asked Questions Document | Notepad2 | Open Source |
| .GAL | Molecular Devices | Data Files | GenePix Array List | Notepad2 | Open Source |
| .GFW | Open Source | GIS Files | GIF World File | Notepad2 | Open Source |
| .GPL | Open Source | Text Files | GNU Public License Text File | Notepad2 | Open Source |
| .GSC | Activision | Game Files | Call Of Duty Game Script | Notepad2 | Open Source |
| .HDM | Openwave Systems Ltd | Web Files | Handheld Device Markup Language (HDML) File | Notepad2 | Open Source |
| .HDML | Openwave Systems Ltd | Web Files | Handheld Device Markup Language (HDML) File | Notepad2 | Open Source |
| .HSK | Huskey Truss & Building Supply | Data Files | Huskey Truss & Building Supply Import File | Notepad2 | Open Source |
| .HTM | Various Developers | Web Files | Hypertext Markup Language File | Notepad2 | Open Source |
| .HTML | Various Developers | Web Files | Hypertext Markup Language File | Notepad2 | Open Source |
| .HTX | Microsoft Corporation | Web Files | HTML Extension File | Notepad2 | Open Source |
| .HVC | Sublime HQ Pty Ltd | Text Files | ASCII Text | Notepad2 | Open Source |
| .ICF | Zoom Telephonics | Backup Files | Zoom Router Configuration File | Notepad2 | Open Source |
| .IML | JetBrains | Developer Files | IntelliJ IDEA Module | Notepad2 | Open Source |
| .IN | Bitplane | Data Files | SmartGENERATOR Template File | Notepad2 | Open Source |
| .INS | Open Source | Data Files | LaTeX Installer Script | Notepad2 | Open Source |
| .JSE | Microsoft Corporation | Executable Files | JScript Encoded File | Notepad2 | Open Source |
| .JSON | Mozilla | Backup Files | Mozilla Firefox Bookmarks Backup | Notepad2 | Open Source |
| .KSH | AT&T Labs | Executable Files | Unix Korn Shell Script | Notepad2 | Open Source |
| .LIS | SourceForge | Text Files | SQR (Structured Query Reporting) Output File | Notepad2 | Open Source |
| .LST | Unknown Developer | Text Files | Data List | Notepad2 | Open Source |
| .M4 | Open Source | Developer Files | Macro Processor Library | Notepad2 | Open Source |
| .MAN | Unknown Developer | Text Files | Unix Manual | Notepad2 | Open Source |
| .ME | Unknown Developer | Uncommon Files | Temporary Delete Me File | Notepad2 | Open Source |
| .MODULE | Open Source | Plugin Files | Drupal Module File | Notepad2 | Open Source |
| .MSH1XML | Microsoft Corporation | Settings Files | Monad Display Configuration File | Notepad2 | Open Source |
| .NFO | Microsoft Corporation | System Files | System Information File | Notepad2 | Open Source |
| .NLS | Uri Wilensky | Developer Files | NetLogo Source Code File | Notepad2 | Open Source |
| .NOW | The Document Foundation | Text Files | Readme Text Document File | Notepad2 | Open Source |
| .PER | Microsoft Corporation | Game Files | Age Of Empires Personality File | Notepad2 | Open Source |
| .PHP | Panic | Web Files | PHP Source Code File | Notepad2 | Open Source |
| .PHP5 | Open Source | Web Files | PHP 5 Web Page | Notepad2 | Open Source |
| .PKB | Oracle Corporation | Developer Files | Oracle Package Body File | Notepad2 | Open Source |
| .PKS | Oracle Corporation | Data Files | Oracle Package Spec File | Notepad2 | Open Source |
| .RCJ | Microsoft Corporation | Text Files | Robocopy Job File | Notepad2 | Open Source |
| .RDF | Unknown Developer | Settings Files | Resource Description Framework File | Notepad2 | Open Source |
| .README | The Document Foundation | Text Files | Readme Text Document File | Notepad2 | Open Source |
| .RPT | SAP | Data Files | Crystal Reports File | Notepad2 | Open Source |
| .SCA | Symantec Corporation | Data Files | Norton AntiVirus Scan File | Notepad2 | Open Source |
| .SCR | Microsoft Corporation | System Files | Windows Screensaver File | Notepad2 | Open Source |
| .SCRIPT | Unknown Developer | Executable Files | Generic Script File | Notepad2 | Open Source |
| .SIF | Microsoft Corporation | Settings Files | Windows Setup Information File | Notepad2 | Open Source |
| .SKI | Motorola | Settings Files | Motorola Phone Skin File | Notepad2 | Open Source |
| .SMS | Sega | Game Files | Sega Master System ROM | Notepad2 | Open Source |
| .SPS | IBM | Data Files | SPSS Program File | Notepad2 | Open Source |
| .STC | Adobe Systems Incorporated | Web Files | Contribute Connection Key File | Notepad2 | Open Source |
| .STE | Adobe Systems Incorporated | Settings Files | Dreamweaver Site Settings File | Notepad2 | Open Source |
| .SVH | IEEE Xplore | Developer Files | SystemVerilog Source Code Header File | Notepad2 | Open Source |
| .UPD | Various Developers | Text Files | Program Update Information | Notepad2 | Open Source |
| .UTXT | Open Source | Text Files | Unicode Text File | Notepad2 | Open Source |
| .VNT | Sony | Text Files | Sony Ericsson Mobile Phone vNote File | Notepad2 | Open Source |
| .WSC | Open Source | Game Files | WonderSwan Color Game ROM | Notepad2 | Open Source |
| .Y | Microsoft Corporation | Raster Image Files | Subsampled Raw YUV Image | Notepad2 | Open Source |
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