Invoice google indexing

[Web Marketing Vicenza]

Hi all

We noted that Google insert in SERP the invoices of VirtueMart. We following the rule to create a /wmfiles out of root directory, but is not enought.

DO you think that we have to add a line in robot.txt?

We try to add Disallow: /*.pdf but no results.

Thanks in advance

[AH]

Do you have any examples?

[Milbo]

Which version do you use?