Would you consider taking a look in The Saboteur (GOG version)?
The game has native widescreen support but it's only Vert-, the only way to get HOR+ in the updated GOG version is by using cheatengine, someone made a fov slider but it only works in the unpatched v1.0 retail version.
Here's the WSGF entry for reference.
EDIT: Actually not even cheat engine seems to work with the latest GOG version .
EDIT2: My bad, cheat engine works fine but you need to manually increase the fov in-game with the numpad - and +. But hey the memory adresses work fine so making a proper WS fix should be simple.