FULLOSA CONVERSION SCRIPT
This is another one of those “small but personally handy scripts” I wrote while revisiting some older projects in newer versions of Blender (tested in 2.40). Possibly someone out there might also find this script useful, and so here it is 
# FULLOSA CONVERSION SCRIPT
#
# BY: ROBERTT
# RELEASED: JANUARY 2006
# SCRIPT VERSION: 1.0
# TESTED ON BLENDER VERSIONS: 2.40
#
# WHAT THIS BLENDER PYTHON SCRIPT CAN DO:
#
# This script turns FULLOSA on
# for all materials in your currently
# loaded .blend file.
#
# This can be particularly useful if
# you are working with older .blend
# files (from previous versions of
# Blender) in Blender 2.40.
#
# USAGE TERMS: USE THIS SCRIPT FREELY,
# AT YOUR OWN RISK, AND ADAPT AS YOU WISH.
import Blender
from Blender import Material
materials = Blender.Material.Get()
# Change materials to FULL OSA
print "
Setting FULLOSA for all materials..."
for m in materials:
m.mode |= Material.Modes.FULLOSA
print "Done!"
Copy and paste the above code into a test file called fullosa.py
or click here to download the script.
RobertT