Hi GT, I'm an independent adviser and can help with this.
How does the order number relate to PDF? Do you have the PDFs saved with as orderno.pdf? For example. 45240511.pdf? If so, I would assume that all the PDFs are stored in a single folder somewhere.
So, you can't do this with just a table. Users shouldn't work directly with tables anyway. So you create a form to interface with the table. In the Double Click event of the nr ordine control you would have code like this:
Application.FollowHyperlink "C:\foldername" & Me.[nr ordine] & ".pdf"
where foldername is the path to where the PDFs are stored.
If you aren't storing the PDFs as I indicated, then you need to define how they are related.