This is part of a multi-volume archive. It cannot be opened or extracted on its own.
To open this file, you will need archiving software, such as (available on WinRAR's official site), 7-Zip (available on 7-Zip's official site), or The Unarchiver for Mac.
Right-click the first part and select "Extract Here" (or "Extract to..."). The software will automatically combine all 13+ parts into the final file(s). Troubleshooting
Ensure you have downloaded all parts of the set (part01 through part13, and likely more).
specific content (game, software, mod) were you expecting it to contain?
If you are missing a part, the extraction will fail. Ensure you have all sequential files.