mp4 file (+4GB) recorded from Simulcast won´t open

Sep 13, 2018
Saved it on external HDD (FAT 32), tried to rename (extension)it, remove it, repair it, split it but no software will open it! What can I do more?
If you can find the video content online you can download it and use VLC to "convert" it to an audio file. There are programs and Firefox addons for downloading streaming video. The legality of this is dependent on the content.