What is the preferred application to edit "all tags" file?

[DavidHB]

Notepad is an entirely competent basic text editor, and is fine if you want to do simple editing on a few lines only. For more complex work, including more fully featured search and replace functions, and a tabbed interface which allows you to access several documents at once, you could look at the free NotePad++.

I'm afraid I don't use OS X, so don't know of a comparable application for the Mac, but I'm sure that there is one.

David