You can check the internal codec information (like H.264 or H.265) by right-clicking the file in a media player to see why it might have a double extension.
The global standard for web streaming and device compatibility. It is supported by almost every smartphone, tablet, and smart TV. 🛠️ Handling the File XXX Family 02.mkv.mp4
Use the VLC Media Player to open files with complex or mismatched extensions, as it supports both MKV and MP4 codecs. You can check the internal codec information (like H
If a device won't play the file, software like Handbrake or Movavi can "remux" the content to a standard .mp4 format without losing quality. XXX Family 02.mkv.mp4