Use the p7zip package. You can extract it using the command: 7z x R0721.7z . Common Troubleshooting Tips

Sometimes files are incorrectly named. If the file has a double extension (like R0721.7z.7z ), try renaming it to just .7z .

7-Zip / Discussion / Help: I'll gladly pay if you can help me

If you encounter errors like "Cannot open file as archive," consider these common fixes:

Based on your request, appears to be a compressed archive file (likely using the 7-Zip format).

when trying to open this file, or do you need help identifying its original source? ⌛⌛ Text search inside a 7z file