REQ: gitk: filename right-click should provide commands "Open", "Explore"

[kxrob]

Feature Request for gitk: A right-click on a filename (lower right pane: in both patch and tree view) should provide extra commands in popup-menu:
"Open" (like in git-gui on top of the diff pane)
"Explore" (open / show in platform file manger)

git-gui should also provide the "Explore" command.
(filename on top of the diff pane - and optinally in the file list pane on top left)

Hints:
On Windows the the following command opens the Explorer and points to a specific file:
explorer.exe /e,/select,"C:\path\to\file.txt"
On *nix/X11 a folder can be explored with "xdg-open DIR" (OS X: "open DIR"). It may be possible to point the file manager to a specific file by detecting the desktop environment & calling the FM directly: nautilus, konqueror, dolphin ...