Framework 1.1 app running on Framework 2.0 installation Does not work... Why?

[ThunderMusic]

Hi,
Our app has been developped using vs 2003 ans framework v1.1. One of my
clients installed the framework v2.0 this week and states taht our app does
not work anymore. Is Framework v.20 retro-compatible to V1.1? Is there a way
to install v1.1 and v2.0 on the same machine? And In the first place, why
could a v1.1 version app would not work on a v2.0 framework? Is there a list
of the main changes that could cause a problem?

Thanks a lot. I know it's a lot of questions, but I think it all revolve
around the same core question: Why?

ThunderMusic

P.S. For those of you that want code, I don't plan to post all the app code
as it would 1) break the licence agreement and 2) be far to big to post
here, and I absolutely don't know which part of the code causes the problem.
It just seems to run at the initialisation of the app (which is also very
big, so)

 

[Andrew Robinson]

What is the specific error or issue that is occurring? Initially, this may
be more helpful than posting the code.

In general, the dotnetfx 2.0 is backwards compatible with the v1.x
frameworks.

-Andrew