Mtcn2008.part2.rar

If you are writing a paper based on this data, your methodology should focus on:

Based on the "MTCN" acronym and typical datasets of this size, this file most likely contains data for one of the following research areas: MTCN2008.part2.rar

You cannot extract "part2" on its own; you must have all parts (starting with part1) in the same folder. If you are writing a paper based on