Just drop files on it to convert the line ends. "Remove duplicate line ends" is useful for files that have multiple line ends on every line because of bad FTP transfer. Warning: It will overwrite any files dropped, so be careful! It will corrupt non-text files.
Changes:
2.0.0 (2005-Oct-06):
Rewritten in C#.
Supports dropping of folders. It will convert all files inside (including inside subfolders).
Warns about overwriting files. You can turn this off by editing the config file.