Found one file extension association related to OmniOutliner and 1 file format developed specifically for use with OmniOutliner.
Platform, operating system: Apple macOS / Mac OS X
Go to: OmniOutliner description
Developer: The Omni Group
The Omni Group software list & details
Developer / company: The Omni Group
OmniOutliner is an amazingly flexible program for creating, collecting, and organizing information. Use OmniOutliner's document structure to brainstorm new ideas, drill out specifics, and line up the steps needed to get everything done. It's more than just an outlining tool—you've got multiple columns, smart checkboxes, customizable popup lists, and an über-innovative styles system at your disposal. Use OmniOutliner to draft to-do lists, create agendas, manage tasks, track expenses, take notes, plan events, write screenplays . . . and just about anything else you can think of.
size: 128px x 128px (.png with transparency)
Note: You can click on any file extension link from the list below, to view its detailed information. The list of extensions used or otherwise associated with the application may not be complete, because many common file extensions on our website, such as jpg (pictures) or txt (text files), can be opened by a large number of applications, or are too general file format. However most, if not all directly associated file extensions should be listed with its appropriate program. Although its likely, that some file extensions may be missing from the list of associated file extensions with the application, yet they can be opened, be part of, or otherwise be associated with the program.
OmniOutliner default file extension associations
Comparison table of actions that OmniOutliner can perform with its associated file type beta
This table might not contain all possible associated or supported file types or may contain incorrect data.
If you need more information please contact the developers of OmniOutliner (The Omni Group), or check out their product website.
File type \ Action