As noted by Aaron Stebner, there is now a registry key you can search for to detect if the Visual C++ 2010 redistributable package is installed a machine, when installing your application.
There are 3 different (but very similar) registry keys for each of the 3 platform packages. Each key has a DWORD value called “Installed” with a value of 1.
HKLMSOFTWAREMicrosoftVisualStudio10.0VCVCRedistx86 HKLMSOFTWAREMicrosoftVisualStudio10.0VCVCRedistx64 HKLMSOFTWAREMicrosoftVisualStudio10.0VCVCRedistia64 Here’s an example of using this in WiX, detecting the presence of the x86 version of the redistributable:
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