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Visual Studio installs the 32-bit version of the CLR on an x86 computer, and both the 32-bit version and the appropriate 64-bit version of the CLR on a 64-bit Windows computer. (Because Visual Studio is a 32-bit application, when it is installed on a 64-bit system, it runs under WOW64.)
https://learn.microsoft.com/en-us/dotnet/framework/64-bit-apps?redirectedfrom=MSDN
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