T0a2022 — Multi.1080p.r-mg.part1.rar

This is the "tag" for the release group that encoded and uploaded the file.

Because this is only "Part 1," you won't be able to open or play it on its own. You will need to download all the subsequent parts (Part 2, Part 3, etc.) into the same folder. Once you have the complete set, you can use a program like WinRAR or 7-Zip to extract the actual video file. t0a2022 MULTi.1080p.R-MG.part1.rar

This is the first segment of a compressed archive. This is the "tag" for the release group