Hi,
I wrote a c# DLL which the option "Register for COM interop" is checked.
When I build the DLL in x64 platform I get a build error:

WARNING : assembly 'mscorlib.dll' targets a different processor.
error MSB3097: File "DllTest.dll" is not a valid assembly.

Can someone please advise ?

thanks,
Yoav.

Yoavo wrote:
Normally you would build a .NET DLL with "AnyCPU" as the target.  What
happens when you do that?

See also this:
http://msdn.microsoft.com/en-us/library/ms973190.aspx#64mig_topic5

From what tool do you get the error?
What assemblies does your C# DLL reference?  Are any of them mixed-mode
(containing native code) and therefore not bitness-neutral?  This would
usually happen with assemblies built with Visual C++ and the /clr option.

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