Youtube 5.part2.rar -

: If part2 is significantly smaller than part1, it is the end of the archive. If they are identical (e.g., both 500MB), it is a standard split.

Because this specific filename is generic, its "identity" depends entirely on where you encountered it. 1. Multi-Part Archive Structure

: The website or forum where you found the link usually contains a "README" or a post describing the contents.