Generate thumbnails of all PDFs in a folder in XP

Hi, Folks
I am trying to sort a large number of heterogeneous PDF files based on the layout of the first page.

I need to parse them, but the parsing logic will have to be specific to each format since in most cases the data is not tagged (i.e., the delimiter is a line break) and since there are a bunch of different formats.

For example, some files are this format
> Author Name
> Title
> Body

and others are this way

> Title
> Author Name
> Body

or

> First paragraph from body
> Title
> Author Name
> Body

and so on.

Anyway, I think the easiest way to organized them properly is to visually scan thumbnails of the first page and drag and drop into the appropriate folders.

Anyone know a freeware product that generate thumbs like this in XP?

The ideal situation would be for the thumbs to be visible next to PDF files in Windows Explorer (i.e., without me having to click on each one to review), but whatever works.

Thanks.