The Mac OS probably doesn't associate the .qdf file with Quicken 2015 in Crossover. Get Info on the .qdf and under the Open With section select Quicken 2015 and Change All to set it system wide.
Please Note: This Forum is for non-application specific questions relating to installation/configuration of CrossOver. All application-specific posts to this Forum will be moved to their appropriate Compatibility Center Forum.
CrossOver Forums: the place to discuss running Windows applications on Mac and Linux
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