>I want to put a Logo at VFP Window ( on left-top ).
>i use command _SCREEN.ICON = "??.ICO"
>( then add THISFORM.ICON = _SCREEN.ICON into every FORM.INIT )
>
>How can i coding for one command line only, no need to coding in every
>FORM.INIT ??
>
>Which application can modifty or create a ICON file ?

Why not just set each form.icon property in the Property sheet, instead doing this in code?
Almost any graphic editor can work with .ICO files. You may try various ones at www.winfiles.com. Also there was Imagedit graphic editor shipped with VFP 5 which works with icons.