Are you, too, annoyed by how difficult it is to just play DVD video files from your hard drive? Simplify your life by adding “Play DVD with VLC” to the right-click menu of every folder in one easy step! Press Windows Key + R to bring up the Run dialog and enter the following command:
REG ADD “HKCRFoldershellPlay DVD with VLCcommand” /ve /d “”%ProgramFiles%VideoLANVLCvlc.exe” -f “dvd://%1″”
That’s it! The effects are instant; try right-clicking on a folder now. 
If you decide this tweak isn’t for you, run this command to undo the change:
REG DELETE “HKCRFoldershellPlay DVD with VLC” /f
do you think that will work on a mac in the terminal?
Sorry, it won’t work. These commands directly modify the Windows Registry, which, of course, isn’t present in other operating system.
For the adventurous: It appears that the same effect can be achieved in Mac OS X, but not nearly as easily. There is a Contextual Menu Items folder inside of the Library folder where you can place special Contextual Menu Plugin files. That’s not directly helpful, but a quick Google search found OnMyCommand, which appears to be a plugin that allows you to create your own menu items. Once you’ve installed the OnMyCommand plugin, the OMCEdit program (find it on the same site) will allow you to customize the menu and create your own right-click item that will launch VLC in full screen DVD mode. The command for your menu item will be something like vlc -f “dvd://__OBJ_PATH__”/.