John-

That is definitely strange behavior. The uninstaller does not explicitly delete any shared directories or shared files (verified hundreds of times internally and thousands of times by users). We do make a call to delete the directory, but only if it's empty. It is possible that there's a bug on NT with InstallShield's DeleteDir function, but that seems unlikely. It's also possible that IS was brought into an inconsistent state with the other installation attempt.

We have, of course, tested this very thoroughly, however, and I assure any other reading this thread that they need not worry about their files being deleted. Were this to happen in the general case, I probably wouldn't have survived to write this e-mail!