Hello, The winreg module has a function for loading a registry key under another registry key, called winreg.LoadKey. Unfortunately, the module doesn't provide a way to unload that key after the user finishes operating with it. There's a patch [1] for exporting the RegUnloadKey [2] API in winreg module as winreg.UnloadKey, similar to how RegLoadKey is exported as winreg.LoadKey. The patch is helped by another one [3], which provides a new module, test.support.windows_helper, for handling various issues on the Windows platform, such as acquiring or releasing a privilege. Unfortunately, it seems there's a dearth of reviewers for this platform. Could someone knowledgeable with Windows be so kind to review these patches? They could make a good addition for Python 3.5. Thank you very much. [1] http://bugs.python.org/issue21518 - Expose RegUnloadKey in winreg [2] https://msdn.microsoft.com/en-us/library/windows/desktop/ms724924%28v=vs.85%... [3] http://bugs.python.org/issue22080 - Add windows_helper module helper /Claudiu