Thank You!
I will give this a try a little later when I can get back on the windows PC... rest of the family are hogging it lol.
Will update this post if I'm successful :)
EDIT:
I'm not sure if I'm doing something wrong but I think you do this one the same as mkrest, so I put my MAIN (renamed to 1.mbn) and the ssw2rest.exe into C:\ and run this in cmd
C:\ssw2rest.exe 1.mbn
all I get is a 'file io error'
I'm using XP Professional 32-bit so it should work :S