his files and programs should be accessible when he chooses to boot to Win2K. Programs would need to be installed separately for XP to work them.
My friend installed Windows xp in a computer which had Windows 2000 in it. He did not repartition it so now when he boots it asks if he wants to boot into 2000 or xp. Now, here is the dumb question, his files from 2000 should still be in that partition right?