Exttra's goal is to provide a graphical user interface to the xattr command. It attempts to allow you to perform all the tasks described in the manual for the xattr command.
From the manual page, "The xattr command can be used to display, modify or remove the extended attributes of one or more files, including directories and symbolic links. Extended attributes are arbitrary metadata stored with a file, but
- Fixed a bug that would cause the Add [Attribute] button to become disabled.
- OS X 10.7 or later
- Intel 64