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That's LORD EMPEROR ApK....
You don't have to worry about viruses and the like in cases like this. That kind of risk is usually regarding changing a file extension on a malicious file to one that indicates executable code.
Regarding the rest, as you probably realize, PDF, docx, and doc all indicate different kinds of files, and changing the name of course does not change content.
In this case, it's simply a matter of m4a and mp4 both sometimes being used to name the SAME kind of files, and some players were only programmed to check for one of them.
Last edited by ApK; 04-28-2018 at 11:17 AM.
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