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Opal outline file
File type: Various data file
File type category:
Various data file
Date updated: February 7, 2013
The OTLN file extension is associated with the Opal a software for Mac that lets you organize just about anything — ideas, reports, lists, notes, projects, graphics — in the form of an outline. The. otln file stores outline.
Use Opal to open .otln outline files.
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