That is Zune.inf in a zip. If you install your Zune using that driver, you do not have to do the HDD Hack. I used this on my Zune (which I just got back) and I can view it in explorer without having installed the Zune Software and without using regedit. I did not need any programs (other than notepad to modify it, but now I wouldn't need it ever) If we throw this where the Driver finder automatically looks, it will work forever with no programs and no regedit.
edit: if Luke ever goes and finishes the second SZIP version, we can throw switch this file out for the regular inf file, and it requires no HDD hack.