: You cannot open part4 on its own. You must have all preceding parts (part1, part2, part3) and any subsequent parts in the same folder.
: Ensure the files are named identically except for the part number (e.g., Archive.part1.rar , Archive.part2.rar ). NOPE22BR4K9.part4.rar
If you obtained this file from an unofficial source (e.g., a "complete guide" for a game or software via a forum link), exercise extreme caution: : You cannot open part4 on its own