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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .1ST | Microsoft Corporation | Data Files | Visual FoxPro Documenting Wizard List | Notepad++ | Don Ho |
| .AD2 | Unknown Developer | Audio Files | ADPCM 2-bit Compressed Voice | Notepad++ | Don Ho |
| .ADA | Open Source | Developer Files | Ada Source Code | Notepad++ | Don Ho |
| .ADM | Microsoft Corporation | System Files | Administrative Template File | Notepad++ | Don Ho |
| .ADOC | Stuart Rackham | 3D Image Files | AsciiDoc File | Notepad++ | Don Ho |
| .AIML | Richard S. Wallace | Developer Files | Artificial Intelligence Markup Language | Notepad++ | Don Ho |
| .ALE | Avid Technology | Video Files | Avid Log Exchange File | Notepad++ | Don Ho |
| .ANDROID | Unknown Developer | Data Files | Android Readme File | Notepad++ | Don Ho |
| .ANS | Open Source | Text Files | ANSI Text File | Notepad++ | Don Ho |
| .AS | Adobe Systems Incorporated | Developer Files | Adobe ActionScript File | Notepad++ | Don Ho |
| .ASC | Symantec Corporation | Encoded Files | PGP (Pretty Good Privacy) ASCII Armored File | Notepad++ | Don Ho |
| .ASCII | Sublime HQ Pty Ltd | Text Files | ASCII Text | Notepad++ | Don Ho |
| .ASE | Adobe Systems Incorporated | Settings Files | Adobe Swatch Exchange File | Notepad++ | Don Ho |
| .ASHX | Microsoft Corporation | Web Files | ASP.NET Web Handler File | Notepad++ | Don Ho |
| .ATT | Unknown Developer | Web Files | Web Form Post Data File | Notepad++ | Don Ho |
| .AXD | Microsoft Corporation | Web Files | ASP.NET Web Handler File | Notepad++ | Don Ho |
| .AXS | Microsoft Corporation | Developer Files | ActiveX Script File | Notepad++ | Don Ho |
| .B | Rockstar Games | Game Files | Grand Theft Auto 3 Saved Game File | Notepad++ | Don Ho |
| .BASH | Apple | Developer Files | Unix Bourne Shell (Bash) Script | Notepad++ | Don Ho |
| .BAT | Microsoft Corporation | Executable Files | DOS Batch File | Notepad++ | Don Ho |
| .BCS | The Wavelength | Settings Files | Batch Compiler Specification File | Notepad++ | Don Ho |
| .BET | Birger Møller-Pedersen and Kristen Nygaard | Developer Files | BETA Source File | Notepad++ | Don Ho |
| .BIB | Oren Patashnik | Text Files | BibTeX Bibliography Database | Notepad++ | Don Ho |
| .BLG | Microsoft Corporation | Data Files | Windows Binary Performance Log File | Notepad++ | Don Ho |
| .BML | Various Developers | Web Files | Bean Markup Language File | Notepad++ | Don Ho |
| .BNX | Open Source | Text Files | Board Neutral Exchange File | Notepad++ | Don Ho |
| .BS2 | Parallax | Developer Files | BASIC Stamp 2 Code File | Notepad++ | Don Ho |
| .BSD | IEEE Xplore | Data Files | Boundary Scan Description Language Data File | Notepad++ | Don Ho |
| .BWP | Fluffy Smoke Entertainment | Web Files | BuRg3r Web Page | Notepad++ | Don Ho |
| .CC2 | Briggs Softworks | Data Files | Calendar Commander Calendar Data | Notepad++ | Don Ho |
| .CF | Proofpoint, Inc. | Settings Files | Sendmail Configuration File | Notepad++ | Don Ho |
| .CHORD | Open Source | Text Files | Song Chords File | Notepad++ | Don Ho |
| .CIK | Corel | Settings Files | Corel Graphics 10 Custom Dual Tone File | Notepad++ | Don Ho |
| .CIL | Symantec Corporation | Data Files | Norton CleanSweep Installation Log File | Notepad++ | Don Ho |
| .CMD | Microsoft Corporation | Executable Files | Windows Command File | Notepad++ | Don Ho |
| .CML | Unknown Developer | Data Files | Chemical Markup Language File | Notepad++ | Don Ho |
| .CONF | Unknown Developer | Settings Files | Generic Configuration File | Notepad++ | Don Ho |
| .COO | Autodesk, Inc. | Text Files | AutoCAD Bounding Coordinates Cookie | Notepad++ | Don Ho |
| .CPQ | Compaq | System Files | Compaq OEM Disc Configuration File | Notepad++ | Don Ho |
| .CRD | Open Source | Uncommon Files | Guitar Tabs | Notepad++ | Don Ho |
| .CS | Microsoft Corporation | Developer Files | C# Source Code File | Notepad++ | Don Ho |
| .CSH | Adobe Systems Incorporated | Uncommon Files | Photoshop Custom Shapes File | Notepad++ | Don Ho |
| .CSX | Microsoft Corporation | Developer Files | Visual C# Script | Notepad++ | Don Ho |
| .CTT | Microsoft Corporation | Data Files | Messenger Contact List | Notepad++ | Don Ho |
| .CUE | Unknown Developer | Disk Image Files | Cue Sheet File | Notepad++ | Don Ho |
| .CXE | Sublime HQ Pty Ltd | Developer Files | Common XML Envelope Data | Notepad++ | Don Ho |
| .DB-JOURNAL | Sublime HQ Pty Ltd | Database Files | SQLite Rollback Journal File | Notepad++ | Don Ho |
| .DBP | Microsoft Corporation | Developer Files | Microsoft Visual Studio Visual C++ Database Project | Notepad++ | Don Ho |
| .DEC | Various Developers | Developer Files | Declaration File | Notepad++ | Don Ho |
| .DFM | Open Source | Text Files | Pascal File | Notepad++ | Don Ho |
| .DIZ | Unknown Developer | Text Files | Description In Zip File | Notepad++ | Don Ho |
| .DOB | Sublime HQ Pty Ltd | Developer Files | Visual Basic UserDocument | Notepad++ | Don Ho |
| .DOK | Nenad Hrg | Settings Files | DesktopOK Icons Layout File | Notepad++ | Don Ho |
| .DP | Stefan Hagel | Text Files | Text Document | Notepad++ | Don Ho |
| .DRC | Open Source | Uncommon Files | Open Mobile Alliance DRM Rights Object | Notepad++ | Don Ho |
| .DSC | Kingsoft | Settings Files | Kingsoft Design Science Equation File | Notepad++ | Don Ho |
| .DTS | CyberLink | Audio Files | DTS Encoded Audio File | Notepad++ | Don Ho |
| .DX | Digital Equipment Corporation | Text Files | DEC WPS Plus File | Notepad++ | Don Ho |
| .EMLX | Apple | Text Files | Apple Mail Message | Notepad++ | Don Ho |
| .EN | Sublime HQ Pty Ltd | Text Files | English Language Translation File | Notepad++ | Don Ho |
| .ERB | Open Source | Developer Files | Ruby ERB Script | Notepad++ | Don Ho |
| .ES | Interscape | Audio Files | ECHOSPEECH File | Notepad++ | Don Ho |
| .EW | OpenEuphoria | Developer Files | Euphoria Source Code File | Notepad++ | Don Ho |
| .EX | Symantec Corporation | Settings Files | Norton Ghost Template Data | Notepad++ | Don Ho |
| .EXAMPLE | Open Source | Settings Files | Example Configuration File | Notepad++ | Don Ho |
| .EXT | Symantec Corporation | Plugin Files | Norton Commander Extension | Notepad++ | Don Ho |
| .EXW | OpenEuphoria | Developer Files | Euphoria Source Code File | Notepad++ | Don Ho |
| .FAQ | The Document Foundation | 3D Image Files | Frequently Asked Questions Document | Notepad++ | Don Ho |
| .FASTQ | Technelysium | Data Files | FASTQ Format | Notepad++ | Don Ho |
| .FDR | Final Draft | Text Files | Final Draft Document | Notepad++ | Don Ho |
| .FFP | Open Source | Text Files | FLAC Fingerprint Data | Notepad++ | Don Ho |
| .FGL | Fifth Generation Systems | Developer Files | Fifth Generation Language Source File | Notepad++ | Don Ho |
| .FNA | University of Virginia | Data Files | FASTA DNA And Protein Sequence Alignment | Notepad++ | Don Ho |
| .FR | Sublime HQ Pty Ltd | Text Files | French Language Translation | Notepad++ | Don Ho |
| .FSA | University of Virginia | Data Files | FASTA DNA And Protein Sequence Alignment | Notepad++ | Don Ho |
| .FSSCRIPT | Microsoft Corporation | Developer Files | Visual F# Script File | Notepad++ | Don Ho |
| .FSX | Microsoft Corporation | Developer Files | Visual F# Script File | Notepad++ | Don Ho |
| .GEOJSON | Open Source | GIS Files | GeoJSON File | Notepad++ | Don Ho |
| .GER | Open Source | Text Files | German Text/html Info | Notepad++ | Don Ho |
| .GFW | Open Source | GIS Files | GIF World File | Notepad++ | Don Ho |
| .GM | GameMonkey | Developer Files | GameMonkey Script | Notepad++ | Don Ho |
| .GP | Sublime HQ Pty Ltd | Developer Files | Gofer Project Source | Notepad++ | Don Ho |
| .GPL | Open Source | Text Files | GNU Public License Text File | Notepad++ | Don Ho |
| .GSC | Activision | Game Files | Call Of Duty Game Script | Notepad++ | Don Ho |
| .GSD | PROFIBUS & PROFINET International | Text Files | General Station Description File | Notepad++ | Don Ho |
| .GWS | Intergraph Corporation | Settings Files | GeoMedia GeoWorkspace File | Notepad++ | Don Ho |
| .HAN | Amazon | eBook Files | Amazon Kindle eBook Data File | Notepad++ | Don Ho |
| .HAY | Open Source | Developer Files | Haydee Web Server Module Content File | Notepad++ | Don Ho |
| .HDM | Openwave Systems Ltd | Web Files | Handheld Device Markup Language (HDML) File | Notepad++ | Don Ho |
| .HDML | Openwave Systems Ltd | Web Files | Handheld Device Markup Language (HDML) File | Notepad++ | Don Ho |
| .HDT | Adobe Systems Incorporated | Settings Files | Photoshop HDR Toning Preset File | Notepad++ | Don Ho |
| .HPF | IBM | Developer Files | High Performance Fortran File | Notepad++ | Don Ho |
| .HRL | Ericsson Computer Science Laboratory | Developer Files | Erlang Header File | Notepad++ | Don Ho |
| .HSK | Huskey Truss & Building Supply | Data Files | Huskey Truss & Building Supply Import File | Notepad++ | Don Ho |
| .HTMLS | Open Source | Web Files | HTML With Server-Side Include | Notepad++ | Don Ho |
| .HTX | Microsoft Corporation | Web Files | HTML Extension File | Notepad++ | Don Ho |
| .HVC | Sublime HQ Pty Ltd | Text Files | ASCII Text | Notepad++ | Don Ho |
| .ICF | Zoom Telephonics | Backup Files | Zoom Router Configuration File | Notepad++ | Don Ho |
| .IDF | Don Ho | Settings Files | MIDI Instrument Definition File | Notepad++ | Don Ho |
| .IIL | Symantec Corporation | Data Files | Norton CleanSweep Installation Log File | Notepad++ | Don Ho |
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