Done. Hmm, I don't think that a 650 KB exe is big, but seriously your right the actual download is not more than that: curl -N -r 129740800-136032256 http://download.microsoft.com/download/8/E/9/8E9BBC64-E6F8-457C-9B8D-F6C9A16E6D6A/KB3AIK_EN.iso -o"Neutral.cab" 129740800 - 136032256 is the begin and end offset to download, easily to get with an good HexEditor The 500+ lines au3 code is used to decompress the broken cab file, rename and sort the files according their architecture. To avoid corrupt downloads, all files are hashed in the end. Should work now in WinXP, too