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RISC OS had it's Icon Bar long before it was even called RISC OS. :-)
Several prominent RISC OS programmers joined Microsoft in the early 90s, I believe joining the OS division, and there were several Acorn machines hanging around on desks in Seattle. It's almost certain that elements of RISC OS influenced the development of Windows 95.
Besides the Icon Bar, the right-click pop-up menus in Win95 almost certainly owe their heritage to RISC OS too.