Radiance Export

I’m having trouble using Jan Walter’s radiance export script. I’m using Blender 2.23 and Python 2.0.1. The error is:

Traceback (most recent call last):
  File "radiance.py", line 7 in ?
ImportError: No module named matrix

And FYI I think the culprit is the line:

import matrix

Any hints or ideas?

Put matrix.py in the directory where Blender.exe is located.

Hey, thanks! I knew it was probably something simple. (I know almost nothing about python). Now I only have to figure out Radiance… :-?