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I've downloaded muCommander and find it better than Finder. When I open folders with QuickSilver it still uses Finder, though. How do I change this behavior?

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According to Apple Tech Note TN2062, you can replace the Finder by telling launchd to run something else upon login:

You can change the global Finder by changing the Program property of that plist. However, it is generally preferable to override the system-wide Finder by placing a modified plist in /Library/LaunchAgents.

Be sure to read the entire thing for warnings. It sounds like a risky idea.

If that doesn't work, QuickSilver might be hard-wired to launch Finder. In that case, you will have to contact its developers and ask them for a new setting.

(Note that things like the File > Open dialog will still use Finder, since that is part of the operating system.)

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That only disables opening Finder at login and reopening it automatically. It doesn't change the default application for opening folders. – user495470 Jan 9 '13 at 7:52

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