Let's talk about the PDF editor interface

Thanks! But all the PDFs I open in the Finder do so correctly in PDF Expert. It only in DT3 that the default option is set wrong, thus not a general problem. Would you still advise to try your trick?

Yes. The idea is to set them all to default to a completely different app, restart, then set them all to your preferred default app. It may not help in your situation, but it worked for me and only takes a couple of minutes to test.

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OK, Thanks, will give it a shot.

Indeed - it worked! DT3 now has PDF Expert as standard to open PDFs.
Many thanks!

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Very cool! I used this to fix the file association with Omni Outliner documents in DT3 as well. I was getting annoyed at using the context menu to Open With… even though it was already set as the default app.