| .AAT | ESRI | GIS Dosyaları | Arcinfo Line Data Attribute Data | ArcInfo | ESRI |
| .ADF | Cloanto Corporation | GIS Dosyaları | Amiga Disk File | Amiga Forever | Cloanto Corporation |
| .AER | Adobe Systems Incorporated | GIS Dosyaları | Adobe Atmosphere World | Adobe Atmosphere | Adobe Systems Incorporated |
| .AEU | Microsoft Corporation | GIS Dosyaları | Microsoft AutoRoute Express Europe Route Data | Microsoft AutoRoute | Microsoft Corporation |
| .AFP | Garmin | GIS Dosyaları | XMap Flight Plan Statistic File | XMap | Garmin |
| .AGB | AGIS | GIS Dosyaları | NAVFone Data | NAVFone | AGIS |
| .AGF | ESRI | GIS Dosyaları | Atlas GIS Native Binary Geodataset | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .AIN | Valve | GIS Dosyaları | Source Engine Compiled AI Nodegraph File | Valve Source SDK | Valve |
| .APL | Matthew T. Ashland | GIS Dosyaları | Monkey's Audio Track Information File | Microsoft Windows Media Player | Microsoft Corporation |
| .APM | Adobe Systems Incorporated | GIS Dosyaları | Aldus Placeable Metafile Image | GIMP | The GIMP Development Team |
| .APP | Nokia | GIS Dosyaları | Symbian OS Application | Symbian OS | Nokia |
| .APX | Ability Plus Software | GIS Dosyaları | Ability Photopaint Studio Image | Ability Office | Ability Plus Software |
| .AQM | Psyberia | GIS Dosyaları | AlpineQuest Map File | Mobile Atlas Creator | Open Source |
| .AT5 | Lowrance Electronics | GIS Dosyaları | Lowrance Map File | Lowrance Endura | Lowrance Electronics |
| .ATX | ESRI | GIS Dosyaları | ArcGIS Attribute Index File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .AVL | ESRI | GIS Dosyaları | ArcView Legend File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .AWX | ESRI | GIS Dosyaları | ArcIMS XML Project File | ArcIMS | ESRI |
| .AXE | Microsoft Corporation | GIS Dosyaları | AutoRoute Map File | Microsoft AutoRoute | Microsoft Corporation |
| .AXT | Adobe Systems Incorporated | GIS Dosyaları | Adobe Photoshop Extract File | Adobe Photoshop CC | Adobe Systems Incorporated |
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