Capture on Window 7 to Run on WIndows XP SP3

I have an application that only runs on Windows 7, it need .Net 4.5. My client wont have Windows 7 deployed for quite a few months yet and require this app to be deployed to there XP SOE.

I have captured .Net 4.5 and C++ 2010 in the same capture and it works as expected on Windows 7 but when run on XP I get the error: This is not a valid win32 application.

Has anyone every captured on Windows 7 and run the virtual app on XP? Is it possible to do with ThinApp?

Any help would be really appreciated.