4.13.0 preview 3 packaging - Could not find a native player for file [...]

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thanks!
So the error message:

LogMediaAssets:Error: Could not find a native player for

Engine version number is 4.13.1-0+UE4.

AvfMedia is enabled under the plugins setting → Media Players.

For 4.13 the list of supported formats is:

		// supported file extensions
		SupportedFileExtensions.Add(TEXT("m4v"));
		SupportedFileExtensions.Add(TEXT("mov"));
		SupportedFileExtensions.Add(TEXT("mp4"));

But it fails. What’s wrong?