Audio Files Extensions - What are audio files and how do I open a audio file?

What are audio files and how do I open a audio file?

File Type Category File Format
.3ga Audio Files 3GPP Audio File
.4mp Audio Files 4-MP3 Database File
.aac Audio Files Advanced Audio Coding File
.acd Audio Files ACID Project File
.aif Audio Files Audio Interchange File Format
.amf Audio Files Advanced Module File
.aup Audio Files Audacity Project File
.brsar Audio Files Wii BRSAR Audio Package
.bww Audio Files Bagpipe Player File
.cda Audio Files CD Audio Track Shortcut
.fda Audio Files Dawn of War Audio File
.fev Audio Files FMOD Audio Events File
.fsb Audio Files FMOD Sample Bank File
.hma Audio Files Sony HI-MD Audio File
.i3pack Audio Files Point Blank Game Data File
.jo Audio Files jo Audio File
.ksf Audio Files Korg Trinity/Triton Sample File
.mus Audio Files Finale Notation File Format
.obw Audio Files Superior Drummer Sounds File
.ogg Audio Files Ogg Vorbis Audio File
.pkf Audio Files Audition Peak File
.pvc Audio Files Panasonic VM1 Voice File
.ram Audio Files Real Audio Metadata File
.rax Audio Files Real Music Store Audio File
.switch Audio Files Switch Package
.w02 Audio Files Split Archive File
.wav Audio Files WAVE Audio File