The v4 exists but is only for usb devices and is given with the recent pad, stick or wheel sold by ms
It is compatible with xp/2000 and 9x/me but isnt distributed on ms site for unknown reasons
What's New In Sidewinder Gaming Control Software 4.0
Compatibility with earlier versions
Version 4.0 of the SideWinder software works only with SideWinder USB-only game controllers.
Installing version 4.0 doesn't delete or overwrite earlier versions of the SideWinder software.
You need to use version 3.02 or earlier to customize your version 3.02-compatible game controllers.
SideWinder 4.0: All SideWinder 4.0-Compatible Game Controllers Are Installed in Same Folder