http://www.MSFN.org/articles.php?action=show&id=38 Thanks, but that doesn't help much, as I have already used that guide to slipstream the hotfix rollup. After opening "WindowsXP-KB826939-x86-ENU.exe", within the strangely-named folder that it extracts to, "sp2\update" contains only the following three files: KB826939.cat update.inf update.ver Are you talking about "update.exe" within the "common" directory? If not, could someone explicitly answer my question?