>A customer reports that when he starts my application (.exe) Windows looks for a diskette in drive A: - this is not done by my app. Rebooting did nto help. I had him reinstall the app to a new folder as a test - the same behavior persists. Reinstalling the VFP runtimes did not help. Starting from a desktop icon or directly from the .exe file produces no change. Any help appreciated.

Why do you think that it's related to your app? Maybe PC is infected with some kind of malware?