The Document Converter (File - Wizards - Document converter) fails if there is no special/user defined installation of Import filter. The message, the user gets, is cryptologic (see attachment). He does not know that he have to install filter for obsolete data formats.
Created attachment 45466 [details] message
Add to EasyHack as André mentioned
http://cgit.freedesktop.org/libreoffice/core/commit/?id=367c0b33e5aa01d8e98973abceac439599d17992