Game update 1.2 required. Add 2 things to (path-to-game) folder: SoftTH (fullscreen, DX9 x86 game) & Widescreen Fix *. In game launcher, select base PLP resolution.
(PLP screenshot with bezel effect)
NOTES:
1. All views, menu & HUD work quite well. But 3rd person has 2 issues: FOV bit strong; when nitro, image is inverted (which is amusing, but best played in flawless 1P views).
2. Widescreen fix requires game update 1.2. Fix's FOV edit feature does not work in PLP.
3. * Download fix here: http://thirteenag.github.io/widescreen_fixes_pack#flatout
View guide for general help with the instructions.