windows explorer - What is the easiest way to find and replace text in 20 text files in a directory?

I have 20 text files with various extensions in a directory.

I want to replace "nnn" with "ooo" in all files.

I could import them into a project in Eclipse or Visual Studio to replace them all but that is overkill and would add other meta files etc.

What is a simple way to do this, I'm thinking: select all files, right click, choose some tool called (e.g. "QuickReplacer") and fill in find and replace, click and done.

Does anyone know of a tool like this?

Answer

GrepWin would do this among others, and it is a Explorer plugin.

However there is quite a big array of different applications available that can do this.

This SO thread on the topic also suggest WinGrep as an option.