Exclude Resources on web platform

Hi,
I'm making a game that works on Webplayer and on other platforms. The problem is that the game is growing too much for a webplayer app so I want to use some audio files for webplayer and others for the other platforms.
So I need to exclude resources files for webplayer version or make a different code reference to the AudioClips for every platform.
I though to use another branch on the repository and switch between branches for every build but I would like to have everything on the same project.
Thanks you.