[mapguide-users] Re: Compile Error: An attempt was made to load a program with an incorrect format.

[Jackie Ng]

It is definitely a 32/64 bit mismatch. 

Check the following:
 - The bitness of the MapGuideDotNetApi and OSGeo.MapGuide dlls using
corflags.exe (this should be 64-bit already for the x64 installer)
 - The bitness of any third party .net libraries 
 - The bitness of the mapguide virtual directory and its child directories
in IIS. I can't locate the setting for you but there is a flag that tells
the web application to run as a 32-bit or 64-bit web application.

All should be 64-bit (and/or Any CPU for .net dependencies)

- Jackie

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