Michael,
In addition to Gavin's reply, make sure the exe/app is not in use and is not marked as read-only.

>I have an old FoxExpress for FoxPro 2.6 Windows application that I had to dust off and make a modification to. When I try to rebuild the application (which always worked fine before) it gets almost to the end and then displays a "File In Use" error just before actually building the .APP file.
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>Any old-timers out there that might know what could cause this?
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>Thanks for your help.