The SET SYSMENU TO DEFAULT should be enough. If it doesn't restore VFP menu then the application didn't closed properly.

>If I want to close the application while having the preview window open, the application closes, but instead of the normal menu I have only Format menu. I have set sysmenu to default in code. If I add it again, I have only Project menu when application closes. What can I do to restore normal menu when application is closed?