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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .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 |
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