I am running 64-bit Windows, and I want to create the registry key HKCU\\Software\\Classes\\Wow6432Node\\CLSID\\{myguid}\\InprocServer32
using C#.
What
By default your C# application is compiled using "Any CPU" (this is the default -- it means that your program will run as a x86 exe on x86 machine, and x64 on x64 machines). What you want to do is change the setting to Win32. Now your program will always run as an x86 exe, so it will be automatically redirected by windows the WOW6432Node. When you access the HKCU\Software\Classes\CLSID{myguid}\InprocServer32 on an x64 machine you will be redirected to the desired key.