If you don't see ".rar", ensure your Windows settings show file extensions to avoid confusing .rar files with other file types. To give you more specific instructions, could you tell me: Where did you download this file from? Are you trying to install a game ? Do you have part 1, 2, and 3 downloaded as well?
"part4" means this is the fourth segment. It is completely useless on its own. 2. How to Use/Extract the File WULNOT-MW.part4.rar
When a file is too large, it is split into smaller parts (.part1, .part2, .part3, .part4, etc.) to make downloading easier [1]. If you don't see "