Was you user sitting on the "Previously opened" list when the error occurs?

Why not create an Icon for each database your users want to access? If your users are always accessing a single database, then you should specify the Folder (/dx:\adagio\data) and Extension (/edat) on the command line for the module. Also, why not have Windows remember the UserID?

It's definitely not Adagio. We open/read/close or open/write/close this file each time it's accessed.