Thank you very much for your help.

Chances are good that the photodiode part is smaller, so it might be easier to single it out.  It might be as simple as one line in the model file, or it could be dozens of related lines.

SPICE netlists are not hard to figure out.  For example, any line starting with "R" is a resistor.  "D" is a diode.  The first letter is always the key.