If you know where the .exe is supposed to be you can use:

If FILE( "c:\path\path\lhttseng.exe")
    Thisform.cmdMyButton.visible = .F.  && one or the other or both (belt & braces - suspenders)
    Thisform.cmdMyButton.enabled = .F.
EndIf

>Hi,
>I want to disable a command button on a form when a certain program like lhttseng.exe is not installed on the user's PC. Can anyone help how to achive this? Thank you.
>
>Regards
>
>
>Syah N