911:First responders (aka Emergency 4) doesn't support wide screen. So menu items will be streched a lot.
Also it doesn't seem to scale the UI with it, so the UI will take in a large portion of the screen. I have no fix for this.

To enable Widescreen, go to the folder where you have the game installed. (steamapps/common/911 First Responders), look for a file called em4.cfg
Open this with a text editing program (eg. MS Word, Notepad, Wordpad).

Press CTRL+F and search for. "<var name="r_xres" value=" (Without " ").
What you will find is.
---
<var name="r_xres" value="*your resolution" />
<var name="r_yres" value="your resolution" />
--
Where your resolution is written you will see the numbers, This is the resolution that the game currently is in.

Change the xres (top line of the 2) to 1920
then Change the Yres (bottom line of the 2) to 1080
Save file and close.
Now start up the game and it will be in widescreen.

If your screen is in a different resolution to 1920*1080, just change the numbers at the xres and yres.
xres is the resolution along the x-axis (Horizontal), Yres vor the Y-axis (vertical).
If you don't know what your resultion is, Go to your desktop, Right click with the mouse and select 'screenresolution' And look at the number it gives you behind 'resolution' The first number you put behind xres and the second number behind yres.

Good luck.