[Workbench] What do the various icons between lock button and file name mean?

I've looked around and cannot figure out what the icons on CAD files (in GrabCAD workbench, in the web interface of a folder with CAD files in it) between the lock and file name mean. These icons range from wireform cubes (prt vs asm is understood), colored cubes (red and black), and an icon of a note page.