RootsMagic 3 will run under Win95, Win98, WinME, WinNT 3.x, WinNT 4.x, Windows2000, WinXP operating systems.
RootsMagic 3 will also run under Vista, Windows 7 & Windows 8, 32-bit and 64-bit operating systems. There are things you need to be aware of when running RootsMagic 3 under Vista and Windows 7. For further information visit: http://support.rootsmagic.com/entries/451524-does-rootsmagic-3-run-under-vista
RootsMagic 3 and earlier versions do not appear stable running on Windows 10.