First and foremost, biggest thanks to Deses on the Steampowered forums for the huge help. It's him who figured how to make this operation work, not me. I'm only writing this down in a tutorial fashion and sharing it so as many people as possible can profit from this!
[title]How to change the Steam's Friend Chat Message Notification Sound [/title] I don't know for you, but the default notification sound that comes with steam really grates on my nerves, is too loud and generally makes me jump in surprise when I receive a chat I wasn't expecting. In case you do not know which sound I'm talking about, listen to the following:
So! You don't like it? Here is an easy tutorial to change it!
1-Find a .wav file more to your liking (or convert any sound file to a .wav).
2-Go to your Steam folder, then into the "friends" subfolder. With a default installation, the path should simply be akin to c:\Program Files\Steam\friends
3- There should already be a file named "message". Get rid of it in whatever fashion you prefer. (for instance, saving a backup in-case you're not sure you want the sound gone forever)
4- Take your new sound file and place it in the folder. Rename it "message", like the default file. (important! The name must be "message", not "message.wav")
5-(Important!) Right-click on the new sound file, press "Properties" and check the "Read Only" box.
6-Ta-daaa, you are finished! Not even need to restart Steam, the next time someone sends you an instant message, it should play your new custom sound. Voilà!
Kisses from your friendly neighbourhood Battlemedic, Celebren