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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .ACCT | IBM | System Files | IBM AIX System Data | IBM AIX | IBM |
| .ACX | Atari Corporation | Game Files | Atari ST Program | Rational Rose | IBM |
| .ADK | IBM | Backup Files | OS/2 Saved SKF Format | OS/2 | IBM |
| .ADN | Microsoft Corporation | Database Files | Access Blank Project Template | Lotus 1-2-3 | IBM |
| .ADX | CRI Middleware | Audio Files | ADX Audio File | IBM Lotus SmartSuit | IBM |
| .AGX | Open Source | Game Files | AGT Game File | Rational XDE | IBM |
| .AIO | IBM | Developer Files | APL Transfer Format File | IBM APL | IBM |
| .AMW | Anark Corporation | Developer Files | Anark Media Studio Workspace | IBM SPSS AMOS | IBM |
| .ANB | IBM | Data Files | Analytical Chart | i2 Analyst's Notebook | IBM |
| .APC | Savvius, Inc. | Data Files | AiroPeek Wireless Trace Capture File | Lotus 1-2-3 | IBM |
| .APP | Nokia | Executable Files | Symbian OS Application | IBM Lotus Symphony | IBM |
| .APX | Ability Plus Software | Raster Image Files | Ability Photopaint Studio Image | Lotus Approach | IBM |
| .AS3 | IBM | Developer Files | APL*PLUS Source Code File | IBM APL | IBM |
| .AS4 | askSam Systems | Backup Files | AskSam Backup File | eServer | IBM |
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