Clarifications about exposing "Any CPU" assemblies to 32-bit COM clients needed

[Dmitry-Me]

This page https://docs.microsoft.com/en-us/dotnet/core/native-interop/expose-components-to-com explains how to expose a .NET Core assembly to COM. It looks very similar to how .NET Framework assemblies are exposed. However there's a major difference: dotnet/runtime#32493

With .NET Framework "Any CPU" assembly can be consumed by both 32-bit and 64-bit clients. With .NET Core "Any CPU" assemblies are accompanied with 64-bit .comhost.dll and so they can only be consumed by 64-bit clients. This is a breaking change and totally unexpected. Would be nice to have it documented.

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Document Details

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• ID: e0842844-005f-5004-022d-fce7a82daff8
• Version Independent ID: 88ddeba8-3b31-95f4-26b2-4a12a7313b47
• Content: Exposing .NET Core components to COM
• Content Source: docs/core/native-interop/expose-components-to-com.md
• Product: dotnet-core
• GitHub Login: @jkoritzinsky
• Microsoft Alias: jekoritz

[tdykstra]

@Dmitry-Me Thanks for reporting that. @jkoritzinsky Please verify the wording of the note as added in #22531