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I did according to your advice it is working now.
Thank you
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The version of ildasm.exe which shipped with VS 2003 is not able to read assemblies which were built with a version of .NET later than 1.1.
However, there is an up to date version of ildasm.exe which is installed with VC# Express 2008 and which can read later assemblies. On my machine it's in the C:\Program Files\Microsoft SDKs\Windows\v6.0A\bin folder.
Do a search if you can't find it on yours.