I was just updating my uLE and SMS apps and noticed that I have USB_MASS.IRX in my SMS folder of memory card slot 1.
I remebered that it is a some sort of USB support driver. Never the less I deleted it and I was still able to nagivate to USB flash drive with uLE and with SMS player.
What's the exact purpose of USB_MASS.IRX and USBD.IRX?
As much information as possible please. :)