Do you still have 9.2 installed on any other machines?
With the .Net add-in enabled, you might start QTP on the v9.2 machine and comapare its Object Identification settings for .Net objects against the v10 machine.
In QTP 10, the SwfWindow object class is listed as part of the .Net Windows Forms. Maybe with QTP 10, there was a distinction made between .NET Windows (Swf) and .NET Web (Wbf) forms. I don't have version 9.2 installed anywhere, so I can't look for myself [img]/images/graemlins/frown.gif[/img].
9.2 and 10 look the same to me. Tools\Object Identification and then I compared properties of swfwindow in .net windows, and plain 'window' in standard windows. They appear to be the same in both 9.2 and 10. Object spy looks like it sees the same thing in both versions to me, too.