I love this game, and the graphics are still great even after 5 years. The game "supports" widescreen resolutions, but when I use a 16:10 res like 1920x1200, the aspect ratio is not adjusted. Everything just looks stretched out and crushed. Not finding any option to change this, I've set it back to 1600x1200. I use the ATI control panel to maintain aspect ratio with GPU scaling, so I get the black borders on the sides, but at least it looks proper.
Anyone know of a way to fix this so that it looks correct in a widescreen res?

Ok, even though you used that winecfg, it needs the prefix environment variable.
WINEPREFIX=/path/to/FlatOut/prefix FlatOut/wine_standalone/lib/wine/fakedlls/winecfg.exe

Windows by default searches for shared libraries (dlls) in the same directory as the executable, followed by other standard paths: http://msdn.microsoft.com/en-ca/library/windows/desktop/ms682586%28v=vs.85%29.aspx#search_order_for_desktop_applications When set to Native, Wine emulates this behaviour.

Ok, first replace your widescreen fix with the newest one.

If you run the game from the command line with ./start.sh it should dump any errors or warnings to that command line.

Where do I have to put this? Somewhere into user.reg?

Good to know, this is quite practical.

Done.

In user.reg i've inserted the last two lines below here now exactly under those:
-----------------------------------------------------------------
[Software\\Wine\\Debug] 1404745317
"RelayExclude"="ntdll.RtlEnterCriticalSection;ntdll.RtlLeaveCriticalSection;kernel32.48;kernel32.49;kernel32.9 4;kernel32.95;kernel32.96;kernel32.97;kernel32.98;kernel32.TlsGetValue;kernel32.TlsSetValue;kernel32.FlsGetVal ue;kernel32.FlsSetValue;kernel32.SetLastError"
"RelayFromExclude"="winex11.drv;winemac.drv;user32;gdi32;advapi32;kernel32"

[Software\\Wine\\DllOverrides] 1404745317
"dinput8"="native,builtin"
------------------------------------------------------------------
and now it's working and not stretched anymore in 1920x1080. :)
I seem to have used the right number.

The link to the patchfiles again because it's not mentioned often enough:
https://github.com/ThirteenAG/FlatOut_widescreen_fix/releases/tag/v1.4

Here is the widescreen fix for FlatOut 2:
http://thirteenag.github.io/widescreen_fixes_pack#flatout2

Looking fine in widescreen.

I'm glad you got it all working!

The line above would be run from the command line with /path/to/FlatOut replaced with the full path to wherever you put FlatOut.

This could probably use some explaining:
The wine program, and related utilities (wine, winecfg, wineserver) can support many 'Windows' instances on the same computer. Even though a copy of wine is shipped with these GOG games, it's not tied to them in any way. What WINEPREFIX does is tell wine which Windows instance you want to work with. Without WINEPREFIX the programs typically default to ~/.wine. Among other things, GOG's start.sh script calls wine with the appropriate WINEPREFIX defined.

See http://wine-wiki.org/index.php/WINEPREFIX for their explanation

As an aside, Wine calls these instances prefixes. PlayOnLinux calls them virtual drives, and CrossOver calls them bottles, but they're all the same thing.

These links are now 404, btw.

I found (what I BELIEVE to the correct) files at http://thirteenag.github.io/widescreen_fixes_pack#sec4 , but I can't get the FO game to work. I placed the three files into the executable's folder, but when launching either the Settings applet or the main game, I get kicked out to desktop.

I'm running Vista Business Ultimate on a Lenovo Thinkpad T400, Type 6474. I can run Speccy and copy more details if necessary.

I did the same and I get a blank screen when the race starts.
My resolution is 1920x1080, Windows 7 64bit, AMD Radeon HD 6800 Series

I have got Catalyst Version 14.4.
It's interesting that the wide screen fix for the Flatout 2 is working fine. Just Flatout 1 is not working.