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I have a C++/CLI assembly that wraps a native 32-bit dll.
The assembly is used both from .Net and COM (office).
Now I have a customer that runs 64-bit office.
Is it possible to create a C++/CLI assembly that uses a native 32-bit dll and exports a 64-bit com interface?
No, you can’t mix code with different bitness in one process on Windows. You need to force 32-bit code into a separate process or convert that DLL.
The latter can likely be achieved by using COM+ (or DCOM which is mostly the same). This is what we usually do with native C++ code. I’m not sure about how easy it is with C++/CLI assemblies.