ActionScript for Flash MX: The Definitive Guide, 2nd Edition By Colin Moock
Chapter 18. ActionScript Language Reference
capabilities.hasMP3 Property
Flash 6
indicates whether the Player supports MP3 sound playback
read/write
System.capabilities.hasMP3
Description
The Boolean hasMP3 property is true for Flash Players that can play MP3 audio files, and false for those without MP3 support. It typically is used to determine the appropriate type of sound file to load at runtime. For example, a movie that detects a system with audio support (via hasAudio), but no MP3 support, could load a regular ADPCM sound.
The corresponding server string for hasMP3 is MP3, with possible values of t (true) and f (false). See capabilities.serverString for details.
