12noon NameTwister

If you need to rename a number of files in complicated ways, Name Twister can do it. (Name Twister replaces the Rename Regular Expression aka RenameRegEx shell extension.)
Name Twister displays a list where you can drag & drop files from anywhere in Windows.

Then you can enter anything from simple search & replace text (such as replace "cat" with "dog") or more complex regular expressions.