Hi "Howker". Mmm, that's odd, as I just downloaded it on my iMac (running Lion) and it opens just fine in Numbers. I also tried on my Macbook (running Snow Leopard) and it opens just fine too. Just for good measure I tried the Excel version too and that opens fine in Office.
When words become unclear, I shall focus with photographs. When images become inadequate, I shall be content with silence. - Ansel Adams