Take a good look at your third screenshot, on some icons there is no filename (same thing happens on AROS x86 + Scalos, see my first screenshot), if you try to widen and narrow the windows you will see that some icons, especially the folders will be cut off.
Actually you have to see the icons as in my second screenshot made on OS3+AfA OS, but you can see them fine even on AROS 68k + Icon.library by PeterK
Also with mose you have to click on the uicona and show the Glow, and there you see the difference with normal OS3.9 icons (Glow Icon), which are not DualPNG.