[Python.NET] This assembly is built by a runtime newer than t he currently loaded runtime

[Dave]

I needed to access .NET dlls compiled for .NET4 and ran into the error:

System.BadImageFormatException: This assembly is built by a runtime newer than t
he currently loaded runtime and cannot be loaded. (Exception from HRESULT: 0x801
3101B)

So I attempted to recompile PythonDotNET for .NET4. In VS2010 I changed all the
project targets to be .NET4 and it compiled fine with only a couple of errors
about System.Security.Permissions.SecurityAction.RequestMinimum being obsolete.
Unfortunately when I tried to import clr I got the following error:

SystemError: dynamic module not initialized properly

Looking further into it I found that in buildclrmodule.bat lines 33 & 66
referenced the .NET2 idalsm.exe:

%windir%\Microsoft.NET\Framework\v2.0.50727\ilasm /nologo /quiet /dll
%ILASM_EXTRA_ARGS% /include=%INCLUDE_PATH% /output=%OUTPUT_PATH% %INPUT_PATH%

I changed this to reference the .NET4 version:

%windir%\Microsoft.NET\Framework\v4.0.30319\ilasm /nologo /quiet /dll
%ILASM_EXTRA_ARGS% /include=%INCLUDE_PATH% /output=%OUTPUT_PATH% %INPUT_PATH%

...and everything works perfectly!

HTH,
Dave

NB: Apologies if this appears twice - I sent it from a different account
previously and don't think it made it through.