Strange Locale settings. My machine runs on a German Windows 7/64 OS, whereas The whole CS is (intentionally) in English. Therefore the configuration folder is located in %appdata%/Adobe/Dreamweaver CS6/en_US
If I start Adobe's Extension Manager from DW (via Commands menu) all extensions are installed alright.
DMXzone Extension Manager however tries to put it into a "German Version" directory structure which messes up my whole installation of DW Extensions. So GOODBYE DMXzone Extension Manager until this is fixed.