File Extensions
Always add a file extension “ .MP3” or “.mp3” to an MP3 file by using single-byte letters. If you add a different file exten- sion, or forget to add the file extension “ .MP3” or “.mp3,” the file cannot be played. In addition, if you use upper case and lower case letters (capital and small letters) mixed together for file extensions, normal play may not be possible.
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