You must have every part of the set (e.g., part1, part2, part3, etc.) in the same folder. If any part is missing or corrupted, the extraction will fail.
Splitting high-definition movies or large software installers. OMUP42t50.part4.rar
Staying within the upload constraints of various hosting services. Extensions for multi-part RAR files include the ".partXXX" You must have every part of the set (e