These two features can interact in an unfortunate way: that "open with" note is an instruction about what to do, and therefore (sort of) executable code, and therefore the gatekeeper security policy applies to it (even though you created the note, it's "part of" the untrusted file, and therefore untrusted). Second, if a document is quarantined (because it was downloaded from the internet, or created by a sandboxed app, or some other reasons), it's considered untrusted, and the gatekeeper security policy will be applied to anything like executable in the file. First, if you set a document to open in a particular app, what it actually does is attach some metadata to the file (think of it like sticking a post-it note onto the file) that says to open it with that particular app.
by using Get Info on the document, and changing the "Open with" pop-up menu, but not clicking the "Change All" button). This answer applies if you set the app for that particular document, not for all documents of that type (e.g.
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