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For a free, flexible shell extension with cascaded menus you should try Fast Explorer 2006. It basically consist of a DLL and a menu ini file. Concerning FFDShow: ffdshow-tryouts hosts the latest builds. They use InnoSetup 5.1.x which unpacks fine with InnoUnp 0.19
Are you sure the file protection error is caused by the codec pack? The only components that I could imagine to conflict with windows would be the WMV and Intel codecs. Maybe the latest beta fixes it for you.