Increasing previewsize in windows explorer

Archived from groups: microsoft.public.windowsxp.configuration_manage (More info?)

Hello everybody,

When you select a picture in windows explorer, you can get in the down
lefthand side, under "details", a preview of the picture you selected.

I would like to know how you can increase the size of that preview.
I've been searching in the registry keys, but I can't seem to find it

Can anybody help me please
Much thanks in advance