| DBASE IV Multiple Index File Backup | |
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MBK is a database backup copy file format used by dBASE software, a DOS utility designed Ashton-Tate in late 1980s and early 1990s. MBK files allow for automatic database records archivization and – if needed – recovery.
Nowadays dBASE market share is marginal as more popular tools based on SQL standard dominate the market. MBK were used by the fourth version of the software and are now obsolete.
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 |