using SFX example on how to COULD be, >>> remove notpad..exe from your windows Install source... (for example with Nlite, >>> make 2 SFX archives, 1: Notepad_old.exe 2: notepad_new.exe --> in these sfx files define, that the content must be extracted to: "%windir%\System32" now you could make a litle javascript to enable a user to chose what version he wants, you could, do this multiple ways, 1 is a checkbox, if ( document.checkbox.check). { '/start notepad_new.exe'} else { '/start notepad_old.exe} or you could even use radio buttons for, none / old / new or whatever you'd like... this would be a lot easier, specialy when, you want to keep WFP on... note this code isn't complete, look at it yourself to get it working, didn't have the time to check out the exact spelling in some parst of it so i left them out, (look at the writefunction to see how)...