To all that answered: I also abhor the kludge that I wrote.
I also recognize that the test would catch possible *valid* filenames. I will attempt to find the keys that cause the rename to occur. However, the point of the patch was to: 1. Provide the developers with a way not to have their Windows system (real or fake) be renamed during development. I got tired of renaming the directories back to what they should have been. 2. Protect the end users from destroying their Windows system during testing/playing. The last thing we should want is the impression that Wine is dangerous because of unexpected consequences due to simple appearing actions. "comp.emulators.ms-windows.wine" still gets complaints from user that have done this very action. Guy