ToBe: I'm experiencing a weird problem following your steps. I compressed my theme files, added them to the i386 folder, edited txtsetup.sif and dosnet.inf,... During setup I don't get any errors. Windows setup copies the theme files correctly to the Resources folder, BUT... it doesn't expand (decompress) the files. For example, royale.ms_ gets renamed to Royale.msstyles, but it's still compressed (bit -by-bit identical to royale.ms_). What step did I miss? Where and how is Windows setup instructed to decompress the files?