Hi Catrin, first I'd like to say welcome, the next is whatever you do don't name the files it's against forum rules you can check the rules in the beginning of each forum.....

O.k now to the codecs you can download them, but it's easier to just download the VLC media player, it has all the built in codecs and plays all the files, it's a free download, you will find a stickie at the beginning of the open discussion forum, it will provide you with the links you need.......