9447939.mp4.mp4 -

Open the file using a standard player like VLC Media Player or Windows Media Player .

In some cases, files are double-extended to hide their true nature (though usually, this involves different extensions like .mp4.exe ). Technical Characteristics of MP4 9447939.mp4.mp4

Having two .mp4 extensions typically happens in one of three ways: Open the file using a standard player like