Now, why would a legitimate course file be named with a strange double extension?
To open the "Ben Marriott - Motion Foundation.7z.003" file, you must have all the preceding parts (001 and 002) in the same folder on your computer. You cannot open part 003 individually. Once all parts are present, you simply use an extraction tool like 7-Zip or WinRAR to open the first file (part .001). The software will automatically detect part .003 and the other segments to reconstruct the full, original folder. Ben Marriott - Motion Foundation.7z.003