I’m not interested in the hex code of the color, but its system name, to use in a Form and match the colors in different versions of windows

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That pane is called the “Details Pane”, as evident by the menu to show/hide it under Organize > Layout. I don’t believe it has a system color since the background is actually an image, which was more obvious in Windows Vista:
In Windows 7, they just replaced it with a quieter image, leaving only the subtle shadow effect under the top border of the pane. In this thread they discuss changing the image in Windows 7, which further confirms that it is probably an image and not a color.