.AC3 audio is Audio Coding 3. The AC3 audio standard is being replaced with AAC, although AC3 audio will continue to live on for many decades due to the number of systems and networks which currently utilize it.
AC3 Audio Software
RER Audio Converter - The Best Converter for AC3 Audio
RER Audio Converter, also AC3 Converter, provides an easy way to convert between popular audio formats such as MP3, WMA, M4A, AAC, AC3 audio, MP2, WAV, OGG, etc. RER Audio Converter also allows you to extract audio tracks from all popular video files including AVI, MPEG, MP4, MPG, FLV, 3GP, ASF, SWF, VOB, MKV, WMV, DAT, RMVB, TS, DVR-MS, MOV, QuickTime, DivX, XviD, etc. Click here to free download RER Audio Converter.