Hard to say, since I don't have that file. Have you attempted in the OS to double click the file or if on Mac, play the file in preview mode?
Bob S
> On Mar 15, 2018, at 07:55 , William de Smet via use-livecode <use-livecode at lists.runrev.com> wrote:
>
> play specialFolderPath("engine") & slash & "sounds/pop.mp3"