.ADB File

File extension adb seems to be mainly used for the main database format of Ability Database program that is part of Ability Office, a British alternative office suite from Ability Plus Software.

How to open:

Use Ability Database, part of Ability Office to open and work with the *.adb files.

How to convert:

You most like can export *.adb databases to CSV or other common database formats with the original program.