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> - Pressing enter renames a file rather than opens it. What?

Press space instead... mostly will "open" the file (preview it).

cmd and down arrow to actually open it. I'm used to it now but it still annoys me!

I always use cmd-o - never knew about cmd-down - it seems to do the same thing - why a different keystroke?

Same here. I just learned about Cmd+down today after using macOS for nearly two decades. I've always used Cmd+o (as in, "open").

But it makes sense. Especially when considering that an Application on macOS is basically a folder (e.g. right click on an app, and select "Show Package Contents"), so navigating "down" into an app would open it.

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