About Backward Compatibility of .NET Framework 4

Posted by wuminqi on Stack Overflow See other posts from Stack Overflow or by wuminqi
Published on 2010-05-12T07:58:56Z Indexed on 2010/05/12 8:04 UTC
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We have an WPF Application build on .net framework 3.5.

Some testers find if they uninstall .net framework 3.5, but install .net framework 4.0, our APP fails to launch itself.

Dose this mean that .net framework 4.0 does not include all 3.5 libs, and users have to install .net 3.5 even though they have 4.0?

I see here are some migration issues listed by Microsoft http://msdn.microsoft.com/en-us/library/ee941656.aspx#windows_presentation_foundation_wpf

Are they all breaking changes so that the backward compatibility is ruined?

Thanks

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