File extension Details of AA3, AAX, AMR, AHX, AIF, AC3, AAC, ATRAC, AOB

Name:	AA3
File Type:	ATRAC Audio File
Popularity:	4
Category:	audio
File Description:	Compressed audio file that uses Sony's ATRAC (Adaptive Transform Acoustic Coding) compression; supported by Sony audio devices and the Connect Music Services online store, which has been discontinued; AA3 files do not include any copy protection or digital rights management (DRM). NOTE: In order for SonicStage to transfer an AA3 file to a Sony device, the ".aa3" file extension may need to be changed to .OMG.
Open Programs:	Windows Sony SonicStage CP Sony Sound Forge Sony ACID Sony Vegas with ATRAC plugin

Name:	AAX
File Type:	Audible Enhanced Audiobook File
Popularity:	3
Category:	audio
File Description:	Multimedia digital audiobook format developed by Audible; may be used by audiobooks available from Audible.com, AudibleKids, and the iTunes Store; similar to the standard .AA audiobook file type, but may include other features such as images and links. Since AAX files support images, they are often used for kid's books; AudibleKids has two types of Enhanced Audiobooks: Picture Books and Graphic Novels; the images are automatically shown as the user listens to the story. AAX files can be played by iTunes and are also supported by the Apple iPod and the Amazon Kindle 2.
Open Programs:	Mac OS Apple iTunes Windows Apple iTunes

Name:	AMR
File Type:	Adaptive Multi-Rate Codec File
Popularity:	3
Category:	audio
File Description:	Compressed audio format developed by Ericsson; used by many 3G cell phones for voice recordings such as MMS messages; incorporates the Algebraic Code Excited Linear Prediction (ACELP) algorithm, which is designed to efficiently compress human speech audio.
Open Programs:	Mac OS Apple QuickTime Player RealNetworks RealPlayer Windows Apple QuickTime Player RealNetworks RealPlayer Mobile AMR Converter AMR Tool

Name:	AHX
File Type:	WinAHX Tracker Module
Popularity:	3
Category:	audio
File Description:	Abyss' Highest eXperience file; .THX sound tracker format originally used on Amiga systems for creating C64-like synthesized music
Open Programs:	Mac OS CocoModX Windows WinAHX or Winamp with WinAHX plug-in

Name:	AIF
File Type:	Audio Interchange File Format   (Most common)
Popularity:	5
Category:	audio
File Description:	CD-quality audio file, similar to a .WAV file; developed by Apple Computer, but based on the Electronic Arts .IFF format; standard CD audio AIFF files use a sampling rate of 44.1KHz, are 16-bit, and have two channels (for stereo sound). Definition of AIFF.
Open Programs:	Mac OS Apple QuickTime Player Apple iTunes Windows Media Player Roxio Toast Windows Apple QuickTime Player Apple iTunes Windows Media Player Roxio Easy Media Creator

Name:	AC3
File Type:	Audio Codec 3 File
Popularity:	3
Category:	audio
File Description:	AC-3, or Dolby Digital audio file format; may contain up to 6 channels of audio, including a subwoofer output (a.k.a. 5.1 surround sound)
Open Programs:	Mac OS Apple QuickTime Player with AC3 Codec Microsoft Windows Media Player Windows Microsoft Windows Media Player Apple QuickTime Player with AC3 Codec Nero ShowTime Nullsoft Winamp CyberLink PowerDVD

Name:	AAC
File Type:	Advanced Audio Coding File
Popularity:	5
Category:	audio
File Description:	Compressed audio file similar to a .MP3 file, but offers several performance improvements; examples include a higher coding efficiency for both stationary and transient signals, a simpler filterbank, and better handling of frequencies above 16 kHz; maintains quality nearly indistinguishable from the original audio source. AAC is the default encoding used by Apple iTunes software.
Open Programs:	Mac OS Apple iTunes VideoLAN VLC media player Roxio Toast MPlayer Windows Apple iTunes Media Player Classic KSP Sound Player VideoLAN VLC media player Roxio Easy Media Creator MPlayer Linux VideoLAN VLC media player MPlayer XMMS with AAC plugin

Name:	ATRAC
File Type:	Sony ATRAC Audio File
Popularity:	1
Category:	audio
File Description:	Audio format used by Sony electronic devices, such as the PlayStation Portable (PSP) and Sony digital audio players; ATRAC stands for "Adaptive Transform Acoustic Coding" and refers to multiple compression algorithms developed by Sony. NOTE: ATRAC files typically have an .AA3 or .OMA file extension.
Open Programs:	Windows Sony SonicStage Transfer to a Sony device via MemoryStick

Name:	AOB
File Type:	DVD-Audio Audio Object File
Popularity:	3
Category:	audio
File Description:	Audio file that stores audio data on DVD-Audio discs; saved in an MPEG format and contains LPCM (Linear Pulse Code Modulation) data; stored in the AUDIO_TS folder in the root directory of a DVD-Audio disc.
Open Programs:	Windows CyberLink PowerDVD Corel WinDVD ArcSoft Total Media Theatre

Name:	AMS
File Type:	Extreme Tracker Module
Popularity:	3
Category:	audio
File Description:	Song (or "mod") created with Extreme Tracker, an audio tracking program
Open Programs:	Mac OS MilkyPlay Lite Windows Extreme Tracker MilkyPlay Lite