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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .AB | Backup Files | Android ADB Backup File | Google Android SDK | ||
| .ABA | Palm | Backup Files | Palm Address Book Archive | Palm Desktop | Palm |
| .ABF | Adobe Systems Incorporated | Backup Files | Adobe Binary Screen Font File | Microsoft Windows Font Viewer | Microsoft Corporation |
| .ABK | Corel | Backup Files | Automatic Backup File | Ability Office | Ability Plus Software |
| .ABU | ASUS | Backup Files | Asus App Backup File | ASUS Backup | ASUS |
| .ABU1 | ASUS | Backup Files | ASUS Backup File | ASUS Backup | ASUS |
| .ACP | Alfresco Software, Inc. | Backup Files | Alfresco Content Package | Alfresco | Alfresco Software, Inc. |
| .ACU | Micro Focus International plc | Backup Files | Machine Independent COBOL Object File | ACUCOBOL-GT | Micro Focus International plc |
| .ADI | Active@ Data Recovery Software | Backup Files | Active@ Disk Image Backup File | Active@ Disk Image | LSoft Technologies Inc. |
| .ADK | IBM | Backup Files | OS/2 Saved SKF Format | OS/2 | IBM |
| .AFI | AOMEI Technology | Backup Files | AOMEI Backupper File Backup File | AOMEI Backupper | AOMEI Technology |
| .AIJ | Oracle Corporation | Backup Files | Oracle Database After-Image Journal | Oracle Database | Oracle Corporation |
| .AJA | AJC | Backup Files | Backup Revision Control Archive File | AJC Revision Archive | AJC |
| .AJL | CA Technologies | Backup Files | ARCserve Backup Journal File | ARCserve Backup | CA Technologies |
| .ARC | Symantec Corporation | Backup Files | Norton Backup Archive | Symantec Norton 360 Version 6.0 | Symantec Corporation |
| .ARM | Oracle Corporation | Backup Files | MySQL Archive Storage Engine Metadata | MySQL | Oracle Corporation |
| .AS4 | askSam Systems | Backup Files | AskSam Backup File | askSam Systems SurfSaver | askSam Systems |
| .ASD | Microsoft Corporation | Backup Files | Word AutoSave File | Microsoft Word | Microsoft Corporation |
| .ASV | MakeMusic, Inc. | Backup Files | Finale Auto-save File | Finale | MakeMusic, Inc. |
| .ATE | Microsoft Corporation | Backup Files | Office Accounting Compressed Backup | Microsoft Office Accounting | Microsoft Corporation |
| .AWB | Nokia | Backup Files | AMR-WB Audio File | Apple QuickTime Player | Apple |
| .AXR | Systems AXIS Ltd. | Backup Files | AXIS Diplomat Report | AXIS Diplomat | Systems AXIS Ltd. |
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