On the bottom of the page, and it's bundled with an executable (custom build of ZSNES I'm guessing), ZSNES 1.51 source, documentation and a ROCK.BIN that runs in ZSNES (and other emulators potentially). Unfortunately, it appears to be a stripped down version of the game:
There is a nice little note in the manual though:This release is a lite version Rock N' Roll Racing that features three playable tracks from the original Rock N' Roll Racing for Super Nintendo.
There is also The Lost Vikings (DOS version) and released earlier Blackthorn (DOS version) both also for free from Blizzard too.SPEICIAL THANKS TO
The ZSNES team