how to add music when I start my CS?

[Adny]

As in renaming it? That seems to be the problem right there. Sadly, simply renaming it won't work; personally, I use Audacity, a free sound editor:

http://audacity.sourceforge.net/


Simply open the program then drag & drop your original mp3 file into it. Next, click file > export. Before choosing where to save it, make sure you have "Save as type:" set to "Ogg Vorbis Files". After letting it export properly, you will have a fully functional .ogg to use in Amnesia. If you have any further questions, feel free to ask or pm me.

Hope that helped