On windows release 7.12.2 after launching and quitting mged on a model. the file that was read and now should be released is not deletable/movable. Log out/in, then deletable/movable. Not a major problem, just an annoyance (so far).
On XP error box pops up entitled "Error Deleting File or Folder". Message in box is "Cannot delete <filename>: It is being used by another person or program. Close any programs that might be using the file and try again."