.AA3 File

The aa3 file extension is mainly related to a proprietary audio format used by Sony - ATRAC.

Adaptive Transform Acoustic Coding is an audio compression technology for MiniDisc media. The format is no longer actively used.

This aa3 file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

Files with aa3 extension is used for a special Adaptive Transform Acoustic Coding (ATRAC) format used by Sony for their MiniDisc format.

How to open:

Various audio editing programs from Sony can still open this file format and work with it.

How to convert:

Sony Sound Forge should be able to export AA3 format to other audio formats, like FLAC.