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 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 664_1_RP.part2.rar
Right-click Part 1 and select "Extract". Tools like WinRAR , 7-Zip , or WinZip will automatically find Part 2 and combine them into the original file. 2. What is "664_1_RP"? If you only have Part 2, you won't be able to read the paper