You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip. How to Extract .7z.001 files - Microsoft Q&A
7zip file with numbers on it like 001 means that you only have a part file of the whole compressed file. Microsoft Learn 3carvideos.7z.001
Look for files named 3carvideos.7z.002 , 3carvideos.7z.003 , and so on. You can use 7-Zip on any computer, including