Right, I've developed an app in 98se, and packaged it with the Visual Studio Installer (a.k.a. Interdev....? - nearly)

It installs happily on XP/W2K, but when I try to run it I get a "Class not registered" error. If I install VB6 on XP and THEN run the app it's perfectly happy, so obviously some VB component isn't being packaged with the installer. My question is, how can I figure out which component it is? The error message does give a Class ID number...