I am fighting the same issue and don't have a solution. However, I think
Adobe has disabled the use of previews/icons and this is causing an issue.

"Luke Williams" wrote:
[color=blue]
> Hello,
>
> I have read through the posts here about missing icons for file types but
> have not found the solution for my problem.
>
> Using Windows Vista Ultimate.
>
> I have Creative Suite CS2 installed and all programs and files work fine.
> However, all AI files (Illustrator) show a blank page as the icon. The
> software icon is on my taskbar.
>
> What I read was that under the Tools, Folder options and File Type you could
> change the icon. But I cannot even see the "File Type" tab!
>
> Arggh!
>
> Appreciate the help, thanks!
>
> Luke[/color]