Open AA file

AA files: what are they and how do I open them?

Unknown file icon Are you facing difficulties opening unknown files on your computer, or wondering exactly what this file is?
We've got the information and best software solutions for opening these files effortlessly.

.aa file type #1: Audible audio

Files with aa file extension are in most cases audio books and other audio programs for the Audible platform by Amazon.

Further details:

The aa file extension is used for a proprietary audio book format used by Audible, an Internet provider of spoken audio entertainment, information, and educational programming. The company sells digital audiobooks, radio and TV programs, and audio versions of magazines and newspapers. It is owned by Amazon.

This format comes in several versions:

  • Format 2 (Quality of AM radio sound - mono)
  • Format 3 (Quality of FM radio sound - mono)
  • Format 4 (Quality of MP3 sound - mono)

Audible audio files are often protected by DRM (Digital Rights Management).

Many current devices support AA format, with notable being Apple's iPods, Microsoft Zune, Creative Zen, Amazon Kindle and other.

MIME types:

Open file with:


A media player for audible audio file format

Audible for Mac

A multimedia player by Audible

Apple iTunes for Mac icon

Apple iTunes for Mac

Program used to organize and plays your digital music and video

Audible Manager

A media player and manager for Audible audiobooks


Wireless audio download service

Apple iTunes for Windows icon

Apple iTunes for Windows

Multimedia file manager and library for Apple users

Amazon Kindle icon

Amazon Kindle

Popular portable e-book reading device from

Audible for iPhone icon

Audible for iPhone

An audio books manager for iOS

Audible for Windows Phone icon

Audible for Windows Phone

Application that allows users to download and playback Audible audio books

Audible for BlackBerry

A BlackBerry application for Audible

.aa file type #2: Generic multi-volume CD image

an aa file extension is related to Generic multi-volume CD image file format rarely used by some disk images management apps.

Further details:

The aa file extension is very rarely used for Generic ISO multi volume image files. ISO buster can open them.

However vast majority of .aa found are Audible audio books.

Open file with:

ISOBuster icon


A highly specialized and easy to use CD, DVD and blu-ray data recovery tool

.aa file type #3: PAML data

An aa file extension is related to the PAML (Phylogenetic Analysis by Maximum Likelihood) software. An aa file stores some kind of data used by PAML.

Further details:

The aa file extension is associated with the PAML (Phylogenetic Analysis by Maximum Likelihood) and used for some its data files.

PAML is a package of programs for phylogenetic analyses of DNA or protein sequences using maximum likelihood. It is maintained and distributed for academic use free of charge by Ziheng Yang.

However vast majority of .aa found are Audible audio books.

Open file with:

PAML icon


A phylogenetic DNA analysis software

.aa file type #4: Prognosis Automated Analyst document file

The AA file extension is associated with the Prognosis Automated Analyst document file format.

Further details:

The AA file extension was also used by Prognosis Automated Analyst for its default document format. Most likely obsolete file format.

However vast majority of .aa found are Audible audio books.

Open file with:


A performance monitoring software used in business-critical systems

.aa file type #5: Unix data

Files with aa file extension might also be found on Unix platform as some sort of system files.

Further details:

The aa file extension was also reported to have been found on Unix-based operating systems, available for various computer platforms. These files supposedly contain loop fix or other syntax error data.

Open file with:

Unix icon


A multi-tasking operating system for various platforms

What is the meaning of a file extension?

File extensions are characters that appear after the dot in a computer file's name. For example, the file "unknown-file.aa" has the file extension "aa". This is used to identify which program should open the file or what file type it is.
File extensions help you organize and manage files. They provide a quick and easy way to identify and associate the file type with the appropriate software.

We can help you open your file

In our database, we have collected a huge number of different file extensions, detailed descriptions, and programs that can be used to open or otherwise work with the file extensions listed in our database.
This database is an invaluable resource for users who want to understand better file extensions and what they can do with them. It also allows users to know different file types with the same purpose.

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We have verified every software listed in our database. The software listed in our database includes links to the developer's or software's website. These links should allow you to download the right program for each file type. Using verified software from reputable sources helps minimize the risk of malware and viruses infecting your computer.