Changing what applications are used to open different file types

hello all...
it seems i am going to be in here quite a lot when getting used to my new mac lol but anyway i have a file type i want vlc player to always use .mp4 and some other file types.. so my problem is when i have these files and i press open with vlc and always use this it seems to only apply it to one mp4 not all mp4 i put on the macbook pro. its not like windows where i would select an application then all files with the extension mp4 or whatever will use vlc.. how can i do this with my mac please?
Message was edited by: paliome

Get Info window is where you can change things:
Right click (Control click) on the file icon using the Finder.
Take a look at the Open with: part of the Get Info window to set the app for that file extension. Click the Change All button so all of these file types open using your preferred application.

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