MSHTML DLL on Windows 10

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I just created a blog post on this issue. The problem is that the Microsoft.mshtml.dll assembly in the Global Assembly Cache becomes unregistered from ActiveX during the upgrade process. To fix this issue, it is necessary to run “regasm” on the assembly:

  1. Open an instance of “Developer Command Prompt for VS2013” (or whatever version of Visual Studio you happen to be using). Run it as Administrator by right-clicking the icon and selecting, “Run as Administrator.”
  2. Navigate to “C:\Windows\assembly\GAC\Microsoft.mshtml\7.0.3300.0__b03f5f7f11d50a3a.” It is possible your path will vary. To verify, go to “C:\Windows\assembly\GAC\Microsoft.mshtml” and type “dir.”
  3. Once you are in the correct path, type regasm Microsoft.mshtml.dll

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