Open Packaging Format 3
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The Open Package file with the extension opf is a format used by the openebook group (https://openebook.org/). Daisy Talking Book v.3 packages must include an opf file if they are to conform to Daisy standards.
Identify it
| Extensions | .opf |
|---|---|
| PRONOM | fmt/2032 |
| Wikidata | Q133252316 |
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From PRONOM, Wikidata. Updated 2026-10-20.