A GDB file is a database file created by MapSource, a GPS route editing and trip-planning application. Although some files must be opened in binary file format (ie. The OpenFileGDB driver provides read access to vector layers of File Geodatabases (. a GDB Group Data File is a special file format by Best Software CRM Division and should only be edited and saved with the appropriate software. A GDB file is created by the GPS route editing software MapSource. What is a GDB file? Files that contain the.