If there is trouble with the Shark.DB file

We can try converting the backup file

File

Maintenance

Backup Database...

Sharkware Database Backup consists of a series of steps that are dependent on each other to ensure a successful backup.
You will need to pay attention and respond to the dialogs for each step.
OK

OK

Database Validation has completed.  Is it safe to continue with the backup?

If there were any error messages from the database validation program you should answer NO.

YES

Database Backup of main database has completed.  Is it safe to continue with the backup?

If there were any error messages from the database validation program you should answer NO.

YES

Select Backup File Name

Use the default

For example SW041024.001

This means YYMMDD.001

Completed Backup of database [Contacts]
To archive file [sw041024.001]

OK