Since is the second half of a split archive, you'll need the first part to actually see what's inside. Based on the naming convention, here is how you can handle it and what the file likely contains: 1. How to Open It
The "RP" in your filename often stands for or Research Project in academic settings. 664_1_RP.part2.rar
If you only have Part 2, you won't be able to read the paper. You should check the source where you downloaded it for the first segment or use a repair tool if you believe the archive is damaged. Do you have the file in the same directory, or Since is the second half of a split
A file ending in .part2.rar is part of a . You cannot extract it on its own; it requires the accompanying "664_1_RP.part1.rar" . If you only have Part 2, you won't be able to read the paper
Ensure you have both part1 and part2 in the same folder.