Rename multiple files

Options for renaming multiple files on Windows

1. Windows explorer: It only renames them to xxxx (y).ext where the only thing that varies is y (an incrementing number).
2. Various utilities available for download: I don't like to risk running some unknown program for something that seems so simple.
3. Command line for in do command. To prepend "3-" to every directory that starts with "60-" run: for /d %i in (60-*) do ren %i 3-%i