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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .A4P | Avanquest Software | Web Files | A4Desk Pro Project File | Avanquest A4Desk Pro | Avanquest Software |
| .A5W | Alpha Software | Web Files | Alpha Five Webpage File | Alpha Anywhere - Alpha Software | Alpha Software |
| .ABD | Interscape | Web Files | Adventure Builder Data | Adventure Builder | Interscape |
| .ADP | Microsoft Corporation | Web Files | Access Project Extension | Microsoft Access | Microsoft Corporation |
| .ADR | Opera Software | Web Files | Opera Bookmarks File | Opera | Opera Software |
| .AEX | Adobe Systems Incorporated | Web Files | After Effects Plug-in | Adobe After Effects | Adobe Systems Incorporated |
| .AGS | John Bridges | Web Files | AfterGRASP Script File | AfterGRASP | Open Source |
| .AHTM | Unknown Developer | Web Files | HTML File | Internet Explorer | Microsoft Corporation |
| .ALX | BlackBerry | Web Files | BlackBerry Application Loader XML File | BlackBerry Desktop Software | BlackBerry |
| .AN | Adobe Systems Incorporated | Web Files | Adobe Edge Animate Project File | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .AP | Fifth Generation Systems | Web Files | Active Page | Google Chrome | |
| .AQF | Liquid Development | Web Files | Aquifer-Generated Web Page | Aquifer One-site | Liquid Development |
| .ARO | Tomahawk Technologies | Web Files | SteelArrow Web Application File | SteelArrow | Tomahawk Technologies |
| .ASA | Microsoft Corporation | Web Files | ASP Configuration File | Microsoft Notepad | Microsoft Corporation |
| .ASCX | Microsoft Corporation | Web Files | ASP.NET User Control File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .ASHX | Microsoft Corporation | Web Files | ASP.NET Web Handler File | LibreOffice | The Document Foundation |
| .ASMX | Microsoft Corporation | Web Files | ASP.NET Web Service File | Microsoft Visual Studio | Microsoft Corporation |
| .ASP | Microsoft Corporation | Web Files | Active Server Page | Mozilla Firefox | Mozilla |
| .ASPX | Microsoft Corporation | Web Files | Active Server Page Extended ASP.NET Script | Safari | Apple |
| .ASR | Adobe Systems Incorporated | Web Files | ActionScript Remote Document | Adobe Dreamweaver | Adobe Systems Incorporated |
| .ATA | Julian Spencer | Web Files | Antenna Project | Antenna - Web Design Studio | Julian Spencer |
| .ATOM | YKOON BV | Web Files | Atom Syndication Format | Apple Safari | Apple |
| .ATT | Unknown Developer | Web Files | Web Form Post Data File | LibreOffice | The Document Foundation |
| .AWM | Likno Software | Web Files | AllWebMenus Project File | AllWebMenus | Likno Software |
| .AXD | Microsoft Corporation | Web Files | ASP.NET Web Handler File | LibreOffice | The Document Foundation |
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