Olaf,
I am using FPD2.6a DOS, I know of no Form.Closable=.F. in it nor do I known of any Form.Closable=.F. in the Registry.
I sure that Form.Closable=.F. works great in VFP. If I could just find the time to convert my 130+ DOS over to VFP9 I would be in fine shape. Known any good over all Tech/Programmers (VFP) near St. Gabriel, LA, Who is willing to work at state pay?