Filename Extensions
If you are seeking information about file extensions, then you are in the right place at right time.

Details of extension .oo3

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

Below, you can find answers to the following questions:

  • What is the .oo3 file?
  • Which program can create the .oo3 file?
  • Where can you find a description of the .oo3 format?
  • What can convert .oo3 files to a different format?
  • Which MIME-type is associated with the .oo3 extension?
OmniOutliner 3 Document .oo3 file icon

OmniOutliner 3 Document

The OO3 file is a OmniOutliner 3 Document. OmniOutliner is commercial outlining software for Mac OS X produced by The Omni Group.
Detailed description not available
Category: Document files
Program name: -
Mime-type: application/octet-stream
Magic bytes (HEX): -
Magic string (ASCII): -
Related extensions:
OmniOutliner 3 Document Template

Other types of files may also use the .oo3 file extension. If you have helpful information about .oo3 extension, write to us!

Is it possible that the filename extension is misspelled?

We found the following similar extensions in our database:

Pervasive DataExchange Log
Ozone Messenger Program Support File
FreePascal Object

The .oo3 filename extension is often given incorrectly!

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

o3 (1), oo (1)

Can't open a .oo3 file?

If you want to open a .oo3 file on your computer, you just need to have the appropriate program installed. If the .oo3 association isn't set correctly, you may receive the following error message:

Windows can't open this file:

File: example.oo3

To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select from a list of programs that are installed on your computer.

To change file associations:

  • Right-click a file with the extension whose association you want to change, and then click Open With.
  • In the Open With dialog box, click the program whith which you want the file to open, or click Browse to locate the program that you want.
  • Select the Always use the selected program to open this kind of file check box.

Supported operating systems

Windows Server 2003/2008/2012/2016, Windows 7, Windows 8, Windows 10, Linux, FreeBSD, NetBSD, OpenBSD, Mac OS X, iOS, Android