 <p>Disclaimer: I'm no <strong>real</strong> a Win32 master :)</p> <p>I never used Qt Creator, but does it create a proper manifest for the exe?<br> maybe the manifest is for a different version (SP1 for example) and you have only the RTM version.<br> Are you using Vista? you can try to run <a href="http://blogs.msdn.com/junfeng/archive/2006/04/14/576314.aspx" rel="nofollow noreferrer">SxsTrace</a> to diagnose side by side issues.</p>