You can't copy files out of ProjectWise?

You can't copy files out of ProjectWise? Last Error 55042: The File Operation could not be completed because the server copy of the file is being accessed by another user? 

No one is accessing the file.  Virus scan is turned off and all ProjectWise permissions appear to be accurate. You've checked the storage location, database and can open the files in the dms folder.  What is going on?

Check the permission on the storage server at the NTFS level. Make sure that the folder / files are not read only. If that is the case reapply the read/write permissions.