Stencyl supports two basic audio file formats: MP3 and OGG. One could be forgiven for making the assumption that this means we, as Stencyl developers, can choose which file format to use, according to our own preference. However, this assumption would be wrong. In actuality, the file formats are tied to specific target platforms. Here is the breakdown in a nutshell:
MP3 is supported by:
Adobe Flash (Flash can also utilize OGG, but not through Stencyl, due to the limitations of the OpenFL framework, on which Stencyl is dependent)
OGG is supported by:
Android
iOS
Windows
Linux
OS X
So in essence, MP3 is supported because the Flash targets won't accept any other format. The OGG format is used for everything else. This means two things: