There is only one file type that uses the .OO3TEMPLATE extension:
Template created by OmniOutliner, an OS X application used to create, collect, and organize information; contains information added by the user that is organized as text, columns, smart checkboxes, pop-up lists, and spreadsheets.
OmniOutliner templates enable you to save styles, themes, and information in order to replicate the same content and appearance in other documents. They can be used for various purposes, such as making a to-do list, creating a meeting agenda, taking notes, tracking expenses, and writing screenplays, and planning events.
To create an OO3TEMPLATE, select. To export an OO3TEMPLATE file, select and choose the OmniOutliner 3 Template file format. To import an OO3TEMPLATE file, select .
NOTE: The OO3TEMPLATE file was introduced in version 3 of OmniOutliner. It is not compatible with OmniOutliner 2 or earlier.
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Updated: February 19, 2016