how to add demos to expansions

hi all,i am a new user,i can make the expansions,that is quite simple enough,but adding the demos whoa,tried what the prompt suggested, blah.drum.sxq it is me obviously but what am I doing wrong? help is defo required,anyone? it would be very welcomed(mick)

^^ Follow Tutor's tutorial

if you want to be able to use the "play" button when you select a drum kit or key group... you need to create a folder in your expansion named [Previews] and then create a .mp3 (or .wav) file with the exact name as the program, minus the program file extension... i.e.... if you have a drum kit name "Cool Drums", then put into the [Previews] folder a file named "Cool Drums.mp3" for example.