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What controls the .NET CLR version downloaded by CorBindToRuntimeEx?

I use the following unmanaged C ++ code to create a CLR instance from an Excel 2003 add-in (COM padding for a .NET add-in):

    hr = CorBindToRuntimeEx(
        0, // version, use default
        0, // flavor, use default
        0, // domain-neutral"ness" and gc settings 
        CLSID_CorRuntimeHost, 
        IID_ICorRuntimeHost, 
        (PVOID*) &m_pHost);

and for the vast majority of machines in our organization (several hundred), this works fine, even those that have several versions of the CLR installed; however, an incorrect (older) version of the CLR is created for several computers, which then cannot load the assembly because it requires the .NET 2 runtime.

Yesterday the first time I launched Process Explorer, and it was pretty revealing, showing the following on one of the problematic machines:

process     pid   type   Handle or DLL
-------     ---   ----   -------------
procexp.exe 5056  DLL    c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\mscorworks.dll
EXCEL.EXE   7180  DLL    c:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\mscorworks.dll

i.e. An incorrect version of the runtime was loaded in Excel, although a new version is available. Now I need to find out why.

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CLR
 @ MSDN

+3

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