MacOS: How to change the default app for a file

Macworld
Jul 11, 2018, 7:00 am570 pts
Back in the pre-Mac OS X and macOS days, Apple’s System 9 and earlier relied on hidden metadata to associate files with apps. File extensions, those bits of text that follow a period at the end of a file (like .doc, .html, or .jpg) were optional, although often used for compatibility with other platforms and…

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