Don’t trust the file name. Trust the data. Download (free, open-source). Open your sone288mp4 file and look for this "best" profile:
: The standard video file format used for high-compatibility across mobile devices and PCs. 2. Why "Best"? sone288mp4 best
: The ".mp4" suffix simply indicates that the video is an MP4 file, which is a standard digital multimedia container format used for storing video and audio. Quality Term Don’t trust the file name