Bug? Maybe not... After installing Diffractor I can not open windows explorer folder by dobbel clicking as usual. I have to open the folders with the CONTEXT MENU ! Instead, what's happening is that the registry seems to have been told to open The folder with DIFFRACTOR! I don't have to explain to anyone why this is disrupting or diotic.
So I have to 1. uninstall Diffractor and hope the uninstaller fix the registry (it may fiddling with the register in the next update also) OR 2. do a manual fix of the registry. If this is a feature and not a bug, please make it mandatory during the installation to choose how to open folder in the future, OR/AND make it easy to find how to change the settings later on.