Most "RTS" prefix files are generated by real-time streaming or recording hardware. The "11" usually denotes the sequence or a specific camera channel.

Target Audience: A general audience interested in what the video actually shows.

To help you produce a blog post, I’ve drafted a versatile template. You can use the version if you're writing a guide on how to manage these files, or the Content Creator version if the video contains something worth sharing. Option 1: The Technical "How-To" Guide

If Windows Media Player is failing you, the VLC Media Player is the gold standard for handling these types of raw MP4 streams.