Question: Why can't AVI format video backed up from the device be played on Windows Media Player?

Answer: When AVI video backed up from the device is played using Windows Media Player (the built‑in player on Windows), the screen may appear black or the video may fail to play at all. 

The reason is that the backup video is encoded in H.265 / H.265+, while Windows Media Player does not natively support H.265 video formats. 

To play H.265 files in Windows Media Player, you would need to purchase a separate plugin from Microsoft.

For a more convenient solution, it is recommended to use VLC Media Player, which can play H.265‑encoded AVI backups without additional plugins. 

Alternatively, you can change the video encoding format to H.264 before performing the backup.