Yes, that is a typo. I spend too much time bouncing between windows and unix - apologies for any confusion due to my sloppiness.
My font files and my CSS file all have lower case extensions.
I've attached a copy of one of the CSS files I tweaked, and a screenshot of my fonts folder on my reader. Hopefully I did the attaching correctly - I never used that forum function before! I guess if they don't work I will edit my post and try to fix them.
The reader is a PRS-650.
Thanks!