How to open a WOW64 registry key from a 64-bit .NET application

Question

My .NET application (any-CPU) needs to read a registry value created by a 32-bit program. On 64-bit Windows this goes under the Wow6432Node key in the registry. I have read that you shouldn't hard-code to the Wow6432Node, so what's the right way to access it with .NET?

Answer 1

In the case where you explicitly need to read a value written by a 32 bit program in a 64 bit program, it's OK to hard code it. Simply because there really is no other option.

I would of course abstract it out to a helper function. For example

public RegistryKey GetSoftwareRoot() {
  var path = 8 == IntPtr.Size 
    ? @"Software\Wow6432Node"
    : @"Software";
  return Registry.CurrentUser.OpenSubKey(path);
}