Reg File for XP - MAXMTU

I need a .reg (reg file) - so that when someone double-clicks it - it will automatically update the registry. Here's what I want the reg file to do: (this is for windows xp or nt only) MAXMTU will value will equal 1024. I don't know if this is possible, but I'm sure someone will tell me if that's the case! Regards ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. ## Platform WindowsNT or XP