I had to do something similar to this to get both Roads and Recreation 1999 and CNNANT 2008 to show up in the current versions of MapSource and BaseCamp, since by default these old maps do not install in the Windows ProgramData directory. So I created a registry file. If for some reason I have to restore my default drive image, I can install these two maps, move the files to ProgramData, then run this registry file to have them show up in MapSource and BaseCamp.

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