Is there any way to download applications to the walkman X series?

i had recently bought the sony walkman x series, thinking it would be vaguely similar to the apple itouch. however to my dismay you are not able to add any additional applications like how you are able to do with an itouch. i love the sound quality and such of the walkman however this endeavor is unfortunate. does anyone know how i might be able to add anything to the walkman x or if it is even possible?