So the house I'm moving into has a, what looks like brand new window in the bathroom... right above the tub/shower

.., worst of all it doesn't even open, it's all WOOD trim, and it's CLEAR glass no frosting grrr, whatta waste I'm thinking.
So I can just imagine the mositure woes with my name on them.... What should I do? I could always replace it with vinyl, but again it's a bathroom window so I need to keep water out of the walls. I'm probably going to tile around the wall.
What are my options for a window in this placement, any special products?