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That "folder" is an OmniOutliner template file package. (The file extension should be .oo3template.) It should go in your ~/Library/Application Support/OmniOutliner 3/Templates folder. Then launch OmniOutliner and choose "New From Template..." in the File menu. "OmniPlanImport" should be one of the options there. Once you've put your data in the new file, save it and drag it onto the OmniPlan app icon and start planning out the dependencies and such.