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Shortcut of ctrl+0 (Explore from Here)in Explorer is a similar as shortcut ctrl+O (Open File) from file menu. For "Explorer from Here" is possibly variant ctrl+E. (If is free)
ctrl+e is an editor shortcut used to remove the current line. i think the confusion between ctrl+o and ctrl+0 is not as great since the shortcut for 'explore from here' is visible in a menu where all shortcuts are based on ctrl+# commands.
Resolved for 3.4.x or earlier, no new info since then -> closing.