.OTLN File Extension

Opal Outline File

Developer A Sharp
3.9  |  10 Votes

What is an OTLN file?

Outline created by Opal, an outlining program for Mac OS X; creates hierarchical lists for organizing notes, projects, reports, ideas, etc.; Opal is the successor to Acta and has been completely rewritten for Mac OS X.

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Programs that open OTLN files

A Sharp Opal

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