A <!--[trackfilename/]--> tag was added back in 2003, but it was later removed because it caused more problems than it solved, according to Andrei. Combined with the <!--[path]--> tag it would probably have provided the information you want.

See the 'Using a "play" button in HTML output' thread in Templates and Themes ([url]http://www.firetongue.com/boards/yabb/YaBB.pl?board=dax;action=display;num=1068256076;st art=6#6[/url])

You can always retrieve the path and track filename using javascript. Take a look at the modified CMI template (CMI_PLAY) and Crisp theme (Crisp_PLAY) at htttp://ocd.juventas.net. They should give you an idea of how to retrieve the desired track info.