User blog comment:Rappy 4187/Technical Update: September 16, 2014/@comment-3183960-20140917141432/@comment-452-20140917142705

I also make much use of sound files, and have just null edited several pages using them, but I am not seeing any changes.

It is therefore likely that this is a problem with the Fallout wiki CSS - however, after pressing the Random Page button 30 times, I have been unable to find any pages using audio files, so I cannot confirm this.