This seems like it would be a reasonable feature to implement in the core (and kind of hard to implement well from a plugin). I could imagine adding a "Tool" to "Preferences->Tools->Tool Paths" for the file manager (ex. start %d in Windows, open %d in OSX, and something like exo-open %d in others, where %d is a directory path), and then adding items to the document tab and document sidebar context menu for "Open in File Manager..." that use that tool command. Maybe also adding a keybinding, and perhaps an API function for plugins like TreeBrowser too support the same functionality.

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