You cannot "play" the M3U file itself. It contains URLs that point to the actual video streams.
Often, these files include the channel name, logo, and category (e.g., Sports, News, Movies). How to Set Up Your M3U Playlist Download channels 552252761 m3u
The phrase likely refers to a specific numeric identifier for an IPTV (Internet Protocol Television) playlist. You cannot "play" the M3U file itself
The most popular and reliable player is the VLC Media Player because it is free, open-source, and supports almost every streaming format. Other popular options include: How to Configure IPTV M3U on Any Streaming Device these files include the channel name
An is a plain-text file that contains a list of links to multimedia content. While it was originally designed for audio playlists, it is now the standard for IPTV.