Version 100?

Version 100?
Originally uploaded by travelinlibrarian.

No, I don't actually purchase digital music from Wal-Mart via Windows Media Player, but when I'm told there's an update available for my computer I get it. (Call me a lemming, but I want my maching UP TO DATE!) Anyway, the updating software left a shortcut on my desktop to the "Downloaded Program Updates" folder so I decided to take a look. It seems that the lastest update to the Wal-Mart Music Downloads software is on version 100. 100!? What sort of numbering scheme are they using? Beyond that, why did I only get updates #9, 15, 24, 83, and 100?