I don't have Steam / CoD here at work, if anyone has some knowhow and has a Windows SDK installed can you run a program called ILDASM.EXE (usually in the \bin folder of the SDK), then from within ILDASM.EXE open up the launcher.exe for CoD and double click on manifest key.
You should see what .NET version is required in the text output (this is assuming the .exe is a .NET application of course)
You can view the manifest of any .NET .exe or .dll, this may help nail down the .NET issue with Win8 and CoD.
Just remeber each version of .NET is idenpendant of each other, i.e. .NET 4.5 does not include all previous versions. If an app was created in .NET 3.5 and the machine only has .NET 4.0 installed, the app wont run. The user would need to install .NET 3.5.
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