You are right, that it has to do with renaming the files. To stop the database from asking for the file each time you open it, go to File, Define File References. For each reference that uses the remaned file, choose "edit". Delete the path that is there and use the the reference and use the Add File button to find the renamed file and put in the new path. (You can also just edit the path if that is easier.) You will have to do this in any file that references the renamed file.