Backround: I run Geosoft Target on my machine which has some compatibility functionality with ArcGIS. (mxd conversion, export to, etc.) I use the Geosoft Target application "stand-alone" and never use the ArcGIS funcions.
Issue: Target installs a ".style" file in ints instalation directory which appears in the Styel manager. If i uncheck the GEosoft Target ".style" file do clear it from the Style Manager it succeeds only in the current local session - the next time i open any other ArcMap doceument including the one in which i disabled it, the style file is automatically re-loaded.
The one possible patchwork solution would be to delete the Geosoft ".style" file but I am more interested in doing it properly in ArcGIS - is there a global setting that prevents 3rd party syle files from loading?