Is there any option to connect XDTouch IrTouchScreen to Arduino?
Looks like your touch screen may talk RS-232. It uses the SP232EEN (a MAX232 clone) to interface with an MCU (Cypress CY7C63803) to get USB. 

Connect wires to T1 IN and R1 OUT (I assume it's on channel 1) to your Arduino for UART communication. You would most likely need to disconnect those pins from talking to the Cypress chip, or they will interfere. Use the +5V and GND pins of the USB interface to power it direct from the Arduino.

Alternatively cut that board off and use a cheap MAX232 interface board to connect to the Arduino - that may be cheaper.  T and R are TX and RX (though from which PoV is anyone's guess).