The suffix "_0" usually denotes a part number, a version identifier, or a placeholder in a sequence. Technical Specifications

.mkv (Matroska Video). This is a flexible, open-standard container format that can hold an unlimited number of video, audio, picture, or subtitle tracks in one file.

"Once_Hes_Out_Of_The_Way" is the descriptive title of the specific segment or episode.

This naming format is standardized to ensure that users or media management software can quickly identify the content, date, and participants without needing to open the file.