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That's because you aren't opening "your" OmniFocus database when you double-click on some other file. Just launch the application by double-clicking the application, clicking the dock icon, using Spotlight or Quicksilver or LaunchBar or Butler, etc. OmniFocus is happy to open any OmniFocus-format file and show you its contents (this is how you selectively restore from a backup or the archive, for example), but it is only willing to sync the database that lives in Library/Application Support/OmniFocus/OmniFocus.ofocus in your home directory.