HI, Im new, please how do I import downloaded models from GrabCAD to Rhino, I dont understand these file formats./
Open Rhino and go to File - Import. At the bottom of the window that pops up there will be a drop-down menu for selecting the file type to import - everything listed there can be imported into Rhino. Choose the file type you're trying to open, or just choose the "all formats" option.
If you just try to go File - Open with files that aren't rhino format, it will not work.