Topic on Talk:Uru: Ages Beyond Myst
I don't know how to upload images either as I have never done that. However, I just took some screenshots in both 4:3 and 16:9 and compared them myself. Now I know exactly what you are describing.
Looks like a side effect to the widescreen support was to increase the fov and as a result, makes it look squashed. Everything does look more narrow in 16:9 than in 4:3. The game might handle FOV differently though because I don't see the squashed effect in other games I play, but I wasn't looking for it either.