| .A5W | Alpha Software | File web | Alpha Five Webpage File | Alpha Anywhere - Alpha Software | Alpha Software |
| .ABM | Unknown Developer | File audio | Music Album | Alpha Five | Alpha Software |
| .ADB | Open Source | File sviluppatore | Ada Body File | Alpha Anywhere - Alpha Software | Alpha Software |
| .ADBLOCK | Alpha Software | File temporanei | Alpha Five Library Temporary File | Alpha Anywhere - Alpha Software | Alpha Software |
| .AEX | Adobe Systems Incorporated | File con plugin | After Effects Plug-in | Alpha Anywhere - Alpha Software | Alpha Software |
| .ALB | Alpha Software | File sviluppatore | Alpha Five Library | Alpha Anywhere - Alpha Software | Alpha Software |
| .ALM | Alpha Software | File sviluppatore | Alpha Five Library | Alpha Anywhere - Alpha Software | Alpha Software |
| .ALX | BlackBerry | File di settaggi | BlackBerry Application Loader XML File | Alpha Anywhere - Alpha Software | Alpha Software |
| .AS4 | askSam Systems | File backup | AskSam Backup File | Alpha Four | Alpha Software |
| .ASI | Borland | File con plugin | ASsembler Include | Alpha Anywhere - Alpha Software | Alpha Software |
| .ASX | Microsoft Corporation | File video | Microsoft ASF Redirector File | Alpha Anywhere - Alpha Software | Alpha Software |
| .AXB | Alpha Software | File sviluppatore | Alpha Five Xbasic Script | Alpha Five | Alpha Software |
| .BMT | Alpha Software | File sviluppatore | Alpha Five Image Library | Alpha Five | Alpha Software |
| .CDX | Microsoft Corporation | File di dati | Compound Index File | Alpha Anywhere - Alpha Software | Alpha Software |
| .DBF | dBase, LLC | File di database | Database File | Alpha Five | Alpha Software |
| .DDD | Alpha Software | File sviluppatore | Alpha Five Data Dictionary File | Alpha Anywhere - Alpha Software | Alpha Software |
| .DDM | Alpha Software | File sviluppatore | Alpha Five Data Dictionary Memo File | Alpha Anywhere - Alpha Software | Alpha Software |
| .DDX | Alpha Software | File sviluppatore | Alpha Five Data Dictionary Index File | Alpha Anywhere - Alpha Software | Alpha Software |
| .FPT | Sage | File di database | ACT! Data File | Alpha Five | Alpha Software |
| .MUF | Alpha Software | File di dati | Alpha Five License File | Alpha Anywhere - Alpha Software | Alpha Software |
| .SEM | Alpha Software | File sviluppatore | Alpha Five Set Data Dictionary Memo File | Alpha Anywhere - Alpha Software | Alpha Software |
| .SET | Xerox | File di settaggi | Document Library Property Set File | Alpha Five | Alpha Software |
| .SEX | Alpha Software | File sviluppatore | Alpha Five Set Data Dictionary Index File | Alpha Anywhere - Alpha Software | Alpha Software |
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