Unable to view PPT presentations in Mail

[royit]

Hello,

I am unable to open PPT files using "Mail" on the Iphone4. I recieve the email when the attachment, and then when I click on the attachment on the bottom, I get a grey screen with the name of the powerpoint, and it says "Microsoft PowerPoint 97-2004" presentation at the bottom. I have attached a file to view.

Thanks!