If you see other files like 1 (1).rar or 1 (2).rar in the same location, they are likely . Keep all parts in the same folder before starting.
: Recommended for its ability to play almost any video format without extra codecs. Guide to opening rar files - Avira 1 (3).mp4.new.rar
the file 1 (3).mp4.new.rar in your file explorer. If you see other files like 1 (1)