| AIX Backup Format | |
| IBM | |
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File with a .BFF extension contains an archive with files stored in a format similar to TAR. Such files are specific to IBM AIX computers.
BFF format is used by the AIX backup and AIX restore tools, in order to create backup copies and data packages for purpose of sharing the IBM AIX system software.
Linux
| .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 |