Another option:
To make propertree normal textcolor be editable at - Explorer & Shell > Explorer > TreeView > TreeItem > Normal
open your theme's shellstyle in a resouce editor and locate this block of text in the UIFILE:
----------------------------------------------------------------------------------------
ProperTreeHost
font="IconFont"
background="themeable(gtc(PROPERTREE, 2, 0, 3802), window)"
foreground="windowtext"
-------------------------------------------------------------------------------------------
Edit foreground="windowtext" to read like this :>
foreground="themeable(gtc(Explorer::Treeview, 1, 1, 3803), windowtext)"
Save the file.
Now in WSB add a textcolor to > Explorer & Shell > Explorer > TreeView > TreeItem > Normal