After some research and trial and error, I figured this out. If you look at the root of the CD you will notice at least 4 Directories. 3ENE -Enterprise 3ENS -Standard 3ENW -Web ENGLISH - if you have an english install cd. You put the Winnt.sif file in the 3EN* folders. Cool part is that you can have a different one(winnt.sif file) for each different install, enterprise,standard,web. I also so far have been able to reduces the cd size to 588 mb. Hope this helps. Trisailing