Cool, thanks for the feedback.
Honestly, I could do without the white stroke. The only reason I added it is because the small icon gets lost when it's used within MB on a dark skin. Maybe I could make 2 versions available or think of something else just for the small version.
3 stripes for MB3 is a genius idea!!
As for the yellow, I took inspiration from the Win10 folder icon colors, but you're right, it looks better with a lighter color.