Peter, you could try to open the "Internet" control panel (for System 8.5ff) or the "InternetConfig" application and look for something like "suffix mapping" - but better be careful, you must know about MIME types and all those technical bits to avoid making it worse... About this "PC icon" thing in Maconverter: They are used whenever there is no "natural" mapping for Poser related files. SimpleText is a poor choice for .obj files, because they are bigger than 32k in 99.99% and SimpleText will refuse them (it is only intended for small read-me's). Setting the "mdos" creator was the best choice for me, because it is not occupied by any real application - whenever you double-click, EasyOpen will ask you which app you want to open it with. You might want to have a look at EasyOpen's various settings, once customized to your needs it is a wonderful helper.