Was this issue ever resolved? Just picked up a Lumia 920 and am experiencing this whether I attempt to access ppts via the SkyDrive app or via IE. Funny thing is, I can access the files just fine on my iPad, but not on my Windows 8 phone :/
My problem is more basic. I can't open SkyDrive at all. When someone sends me something by SkyDrive and I click to download or open a window comes up asking me to open Hotmail account. I have enough email addresses already. I don't want a Hotmail account. Others I know can open SkyDrive without this window coming up. I have Windows 7 but so do they.