Download documents and audio to mobiles

Hi our customers need to buy and download audio files.

Most want to install on mobile devices directly from download email we send them.

Linking to a file seems to open up on safari on the iphone. Instead it would be preferred to import directly in itunes library on the phone when clicked on the linked.

Do we need a 3 party plugin to do this or send to a landings page in the IFS campaign builder.