He made a note that it only started occurring when he added the OemPnPDriversPath option. I'm using FileSystem=* in my winnt.sif file and have no problems. However, I'm not using the OemPnPDriversPath option in mine. I think the issue could be with both. Maybe it's expecting to use a file system that allows for semi-colons in path names (which doesn't exist), therefore reports an error at the first line out of FileSystem and OemPnPDriversPath? Just an idea. The semi-colon is used as a separator for paths, so quoting the whole line is going to make it think the path is inclusive of those semi-colons. Still working with FileSystem, try using FileSystem=LeaveAlonehowever, personally I don't think the issue is with FileSystem. - stebie