Which sort of media are your files on (e.g. USB, SDCard?). You also have to make a call to fx_media_open() before you can access the files on a media device. There is example for USB mass storage FileX access as a sample Synergy application, www.renesas.com/.../Application_Notes.jsp ( Renesas Synergy™ Project USBX™ Mass Storage Class (Host)
R30AN0239EU0103
(R30AN0239EU0102) )