A daily updated filename extension database!

AAO file extension

The table below provides useful information about the .aao file extension. It answers questions such as:

  • What is the .aao file?
  • What program do I need to open a .aao file?
  • How can the .aao file be opened, edited or printed?
  • How can I convert .aao files to another format?

Table of Contents

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database

✅ Agenda At Once Database

AAO file is an Agenda At Once Database. Agenda At Once is a personal information manager (PIM) and to-do application for Microsoft Windows.
Category: Data files
Application: Agenda At Once
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
AAO aliases:
AAO related links:
AAO related extensions:

Other types of files may also use the .aao file extension.

🚫 The .aao file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

aa, aai, aal, aap, ao, xao

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Dune HD Image
Apollo Advanced Playlist
ActionOutline Outline
Audible Audiobook
Agent Animation List
SALOME Geometry XAO Data

🔴 Can't open a .aao file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .aao file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .aao file extension, write to us!

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