: This indicates that the original large file (often several gigabytes) has been split into smaller segments (Part 1, Part 2, etc.) for easier uploading and downloading. You need all corresponding parts (e.g., part2, part3) in the same folder to extract the final video using software like WinRAR or 7-Zip . Nature of the Content

: You cannot open "part1" successfully without the subsequent parts of the archive.

: Downloading such files may involve copyrighted material distributed without authorization.

: This usually stands for Movie or Main Feature , distinguishing the primary content from trailers or bonus material. Alternatively, in some technical circles, it can denote a specific uploader or encoding group.