: You cannot "open" part 3 by itself. To extract the contents, you must have all parts (part1, part2, etc.) in the same folder.
: Once all pieces are downloaded, you right-click on Part 1 and select "Extract Here." The software will automatically pull data from Part 3 and the others to reconstruct the original file. Potential Contexts for "REOTR-MW" REOTR-MW.part3.rar
: The "MW" and "part3" suggest this specific file contains a large batch of high-resolution textures, which are too heavy for a single download. : You cannot "open" part 3 by itself