This is a Matroska Multimedia Container, a standard file format used for high-definition video that can hold multiple audio tracks and subtitle streams. Common Identification Issues
If the file is part of the show actually titled 24 (starring Kiefer Sutherland), media servers can get confused between "Episode 24" and the show title "24," often failing to list all episodes correctly. Recommendation To identify the content, you should: prmoviesrequests ep 24.mkv
Right-click the file and check "Properties" (Windows) or "Get Info" (Mac) to see if there is a "Title" or "Comments" field. This is a Matroska Multimedia Container, a standard