Peter's Flexible RenAmiNg Kit (PFrank)

If you ever need to rename lots of files in Windows, then an ideal tool for the job is PFrank(the "Peter" in the name is not me, by the way).

You can get more information and download here.

It has tons of useful features including:

• Support for regular expressions
• The ability to preview changes before you perform them

And it's completely free.

I used it once when I was preparing to upload lots of files into SharePoint (to make sure that any characters which are not allowed were handled in advance)

Invaluable.