| .A5W | Alpha Software | Webfiler | Alpha Five Webpage File | Alpha Anywhere - Alpha Software | Alpha Software |
| .ABM | Unknown Developer | Lydfiler | Music Album | Alpha Five | Alpha Software |
| .ADB | Open Source | Udviklerfiler | Ada Body File | Alpha Anywhere - Alpha Software | Alpha Software |
| .ADBLOCK | Alpha Software | Midlertidige Filer | Alpha Five Library Temporary File | Alpha Anywhere - Alpha Software | Alpha Software |
| .AEX | Adobe Systems Incorporated | Plug-in-filer | After Effects Plug-in | Alpha Anywhere - Alpha Software | Alpha Software |
| .ALB | Alpha Software | Udviklerfiler | Alpha Five Library | Alpha Anywhere - Alpha Software | Alpha Software |
| .ALM | Alpha Software | Udviklerfiler | Alpha Five Library | Alpha Anywhere - Alpha Software | Alpha Software |
| .ALX | BlackBerry | Indstillingsfiler | BlackBerry Application Loader XML File | Alpha Anywhere - Alpha Software | Alpha Software |
| .AS4 | askSam Systems | Sikkerhedskopifiler | AskSam Backup File | Alpha Four | Alpha Software |
| .ASI | Borland | Plug-in-filer | ASsembler Include | Alpha Anywhere - Alpha Software | Alpha Software |
| .ASX | Microsoft Corporation | Videofiler | Microsoft ASF Redirector File | Alpha Anywhere - Alpha Software | Alpha Software |
| .AXB | Alpha Software | Udviklerfiler | Alpha Five Xbasic Script | Alpha Five | Alpha Software |
| .BMT | Alpha Software | Udviklerfiler | Alpha Five Image Library | Alpha Five | Alpha Software |
| .CDX | Microsoft Corporation | Datafiler | Compound Index File | Alpha Anywhere - Alpha Software | Alpha Software |
| .DBF | dBase, LLC | Databasefiler | Database File | Alpha Five | Alpha Software |
| .DDD | Alpha Software | Udviklerfiler | Alpha Five Data Dictionary File | Alpha Anywhere - Alpha Software | Alpha Software |
| .DDM | Alpha Software | Udviklerfiler | Alpha Five Data Dictionary Memo File | Alpha Anywhere - Alpha Software | Alpha Software |
| .DDX | Alpha Software | Udviklerfiler | Alpha Five Data Dictionary Index File | Alpha Anywhere - Alpha Software | Alpha Software |
| .FPT | Sage | Databasefiler | ACT! Data File | Alpha Five | Alpha Software |
| .MUF | Alpha Software | Datafiler | Alpha Five License File | Alpha Anywhere - Alpha Software | Alpha Software |
| .SEM | Alpha Software | Udviklerfiler | Alpha Five Set Data Dictionary Memo File | Alpha Anywhere - Alpha Software | Alpha Software |
| .SET | Xerox | Indstillingsfiler | Document Library Property Set File | Alpha Five | Alpha Software |
| .SEX | Alpha Software | Udviklerfiler | Alpha Five Set Data Dictionary Index File | Alpha Anywhere - Alpha Software | Alpha Software |
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