Mario,
MODIFY FORM requires the VFP development system to be installed on the machine, so that is probably not the option you are looking for.
Otherwise, you would have to either write or find a form designer that can deal with .SCX/.SCT files. I'm not aware of any such tool.
>I need provide a way to modify a form at runtime, and save the changes. Exist a control for do it in VFP 6 (and maybe 8 in the near future)?
Steve Gibson