TypeMock reference with bad HintPath locates TypeMock.exe

I have a project with a reference to TypeMock.dll. In the csproj file, the reference looks like this:
<Reference Include="TypeMock, Version=3.5.1.0, Culture=neutral, PublicKeyToken=3dae460033b8d8e2">
<SpecificVersion>False</SpecificVersion>
<HintPath>C:Program FilesTypeMockTypeMock.NETTypeMock.dll</HintPath>
</Reference>

The reference is old. I'm currently using version 3.7.1. As long as the HintPath is valid, this resolves correctly. The automated testing machines have TypeMock installed on D: instead of of C: so the HintPath is not valid there. These machines can't build the project because the reference resolves to TypeMock.exe, not TypeMock.dll. Apparently, there's an ambiguity in the identification of these two files.

How can I fix this to correctly compile in the two environments? One choice would seem to be to modify the project reference to replace the HintPath with $(TYPEMOCKROOT)TypeMock.dll. If this works, I'll consider it. However, it will require hand-editing all projects that reference TypeMock. Another choice might be to convince the owners of these machines to install TypeMock on C: (fat chance!).

Can you suggest a better solution to this problem?

Thanks.