[petek]

Sanddrag is probably correct in his advise. However, if a lot of constraints have been lost or you continue to have problems, I suggest you go back to the PC which you got the files from and create a new set of files using Pack and Go (from Windows, right-click on the main assembly file and pick Pack and Go from the menu). This will create a duplicate set of files with their database linkages. You have the option of putting all files in a single directory or of maintaining the existing directory structure.