The MS-DOS "Attrib" command allows you to add and remove attributes from a file -- even if the file is hidden or you cannot start Windows. You can also use this command to modify the attributes of a ...
I used to use an Automator action for this, but Mac OS X Hints unearthed a sweet Snow Leopard shortcut for geeks: the ability to show or hide hidden "dot" files in any Open or Save As dialog. The ...