7zip file with numbers on it like 001 means that you only have a part file of the whole compressed file. Microsoft Learn
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 3carvideos.7z.001
The software will automatically detect the remaining parts ( .002 , .003 , etc.) and stitch them back together into the original video files. Troubleshooting 7zip file with numbers on it like 001
Select the menu option (or your chosen extractor's menu). Choose "Extract Here" or "Extract to 3carvideos/" . 3carvideos.7z.001