Unable to find RegKey for .vcproj or .vcxproj files in solutions

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If running VPC results in this error, you need this registry key:

This is a text file used internally by a Valve Software technology, such as GoldSrc, Source, and/or Source 2 engine.
To open this file, copy the following text into a text editor such as Notepad++, and save it with "save as type" being "all files" and .reg appended to the file name. Then open the file in the appropriate tool.

Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\VisualStudio\10.0\Projects\{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}] "DefaultProjectExtension"="vcproj"