Universe open problem of c++

Question

I wrote piece of code to open universe, it works in XI3.1(12.1.0.914) but did not work in XIR2(11.5.0.0). the code is:
     #import "designer.tlb"
      Designer::IApplication* mApp;
      Designer::IApplicationPtr lApp(__uuidof(Designer::Application));
      mApp = lApp.Detach();
      mApp->LogonDialog();
      mUniverse = mApp->Universes->Open().Detach();
here is what i did:
1) compile the program in the environment of XI3.1, generate release exe file
2) copy the exe file to another XI3.1 machine and it can run
3) copy the exe file to another XIR2 and exception occured.

Answer 1

thank you for your reply, but i still don't quite understand the reason.
the tlb file provide me the COM interface that i can use in my application. when i compile my code with XIR3, actually i don't need to look for any file except designer.tlb. the dlls are dynamically loaded in the runtime. For COM interface, BO should provide the backword compatabiliy. As long as the COM API i called exist in designer.tlb of XIR2, my application should be able to run in that enviroument.
Such as in c++, if you only add member functions for class in one dll. you recompiled the dll. and the application using that dll does not need to recompile.