Convert a workgroup information file from a previous version of Microsoft Access.
To take advantage of security and performance improvements, you should re-create the Workgroup Information File as described below:
Create a new workgroup information file, making sure to enter the exact, case-sensitive name, company name, and workgroup ID that was used to create the original file. Failure to re-enter the exact entries that were used to create the original file will create an invalid Admins group.
Re-create any group accounts, making sure to enter the exact, case-sensitive user name and PID for each user.
Tell other Microsoft Access 2000 users in the workgroup to use the workgroup Administrator to join the new workgroup information file.
Click Next to see how to Share a previous-version secured database across several versions of Microsoft Access.
Very good posting regarding conversion of access 97 or higher version. Sometimes we get error due to version issue. here is one more blog which solve version issue you can check it from here
http://officerepair.wordpress.com/2008/04/17/ms-access-unrecognized-database-format/