| Windows Backup Format | |
| Microsoft | |
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File with a .WIN extension contains a backup copy of another Windows system file, so that it can be restored in case of damaging it or deletion.
WIN files are often used in the process of recovering Windows system after a critical error or after a failure of update installation. Windows recovery tool may have references directly to such files.
Windows
| .ab | Google Android Debug Bridge Backup Format |
| .aba | Palm Address Book Archive Format |
| .abbu | Apple Address Book Archive Format |
| .abf | Adobe Binary Screen Font Format |
| .abk | Ability Write Backup Format |
| .acp | Alfresco Exported Repository Format |
| .adi | Active@ Disk Image Format |
| .aea | Ae Timer Alarm Document Format |