MP4 is a container that contains various kinds of data, so when there is a problem opening the file, it usually means that data in the container (an audio or video codec) is not compatible with the device’s OS.

On some devices, particularly mobile, opening this file type can be problematic. On Windows, it opens in Windows Media Player. There is no need for third-party software. Simply double-clicking the file opens it. MP4 files open in the operating system's default video player. Many consider MP4 to be one of the best video formats available today. It is also a popular video format for streaming over the Internet, such as on YouTube. It is compatible with a wide range of devices and operating systems, using a codec to compress file size, resulting in a file that is easy to manage and store. MPEG-4 (MP4) is a container video format that can store multimedia data, usually audio and video. If there is a problem playing the file on a device, then use Aimersoft DRM Media Converter for Windows to remove DRM protection.

On Windows, several other options are available, such as MediaMonkey, Winamp, and Helium Music Manager. The cross-platform option, which includes all popular operating systems and mobile, is VLC media player. Since M4P files protect iTunes files, naturally the default program for opening them is iTunes. The specific name of Apple’s DRM protection is “ FairPlay,” which is precisely what protects the content in M4P files. Essentially, Apple uses this file format to prevent unauthorized use of the music files that are available for download from the iTunes Music Store. Apple iTunes Music Store (M4P) file is an Advanced Audio Coding (AAC) file that protects its content with Digital Rights Management (DRM) technology.

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