They can be installed, I've done it multiple times. There's also an Autorun.INF and ICO file in the top directory (two above that folder).
Here's a link to the drivers in question, they're the x64 ones. http://www.sonnettech.com/support/do..._v184.108.40.206.zip
BTW, 99% of the time using a mac makes no difference at all. All of my hardware is compatible with Windows natively other than a few small things like iSight and my onboard keyboard/mouse. The K&M even function minimally without drivers. The only portion of my computer that is completely foreign to Windows is the EFI aka BIOS.