WinRep utility is for fast search and replace over a set of text files. You select the files, then choose what to search and replace. Where it really shines is when you work with the same set of files over and over; it keeps a history of files, so you can just choose from the history rather than having to locate the files each time.
Relevant Links
Features
The winrep program is designed to be as small, fast and efficient as possible. The GUI is simple, the searches are fast, and it doesn't do anything other than what it's supposed to: search and replace in text files.