When you get a file-open error with a gINT database, there are several steps to try to resolve it:
NOTE: a problem library file does not have to be opened in order to repair it. Use the Browse (three-dot) button at the upper right corner of the Files box in the gINT UTILITIES Repair/Compact Databases window to select files for this utility without opening them in gINT.
You will need Read-Write permissions for the file(s) to execute the Repair/Compact Databases utility on them.