I am doing

And I got this warning

Change %s to %@ get rid of the warning

Move the mouse all the way up or press SHIFT+COMMAND+’F’

Pick a text file and use Ctrl-I to change the ‘open with’ application.

It is probably the easiest way.

More info in

http://superuser.com/questions/231854/default-editor-for-files-without-file-name-extension-in-mac-os-x

Before Ctrl-I, I actually tried to open ~/Library/Preferences/com.apple.LaunchServices.plist. It opens up XCode4 which is actually not an ideal tool to edit a plist.

Use -printf to print the full file name (including the directory)

Useful for construction of a Java CLASSPATH

After installing the Xcode 4 GM, it replaces the underlying Xcode executable of the Xcode icon on Dock to 4 too.

I hope this Xcode 4 is a lot more robust Xcode 3