Unrecognized Database Format
The "unrecognized database format" error message is the most often errors that leads to corruption in Microsoft Access Database and appears when trying to open an Access Database.
Unrecognized Database Format error can cause due to two common reasons:
Cause
The above error appears when you are trying to open the Access Database in the lower version of MS Access but the database was created in the upper version of MS Access.
Solution: At this, you will need to convert the database to a lower version of MS Access, using your current version. By converting your database you can open the database with an older version of Access. The described action is only possible if you you have the newer version of Access however. you can convert the database as mentioned in the screenshot below:

If you still facing the "unrecognized database format" error, then Download Corrupt Access Database Repair software. Demo version of Repair Corrupt Access Database software will allow its users to view the content of repaired MS Access Database but does not allow to save the repaired MS Access databases.
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