I guess there's no way to disable it within Pro|E. The three responses I got were to password protect the zip files using a simple password known to all. This would prevent Pro|E from accessing them but allow users to get into them. This works, but it led me to another discovery. We sue WinRAR as our compression utility, if I save them as *.rar files instead of *.zip, Pro|E doesn't recognize them at all.