[2018 WORKING] Splitscreen screen fix 21:9 ultrawide

It's a tutorial to fix the resolution on splitscreen for ultrawide(21:9) users.

Tutorial

BEFORE http://prntscr.com/ir8yyw
AFTER http://prntscr.com/ir8zn6

1. Go to this folder: G:\SteamLibrary\steamapps\common\Left 4 Dead 2\left4dead2
   If you don't know how to find the folder you go to steam library ->
   right click on Left 4 Dead 2 -> properties -> local files -> browse local files -> left4dead2
   
2. Now you need a hex editor, personally I prefer to use Notepad++[notepad-plus-plus.org], so I will instruct how to use it.
   
3. Copy the file pack01_000.vpk (to backup) now open it (the original) with notepad++, press ctrl+F and paste

   widescreen_horizontal_split

4. This tutorial is for 21:9 resolutions, I think my "aspect" works for all 21:9 resolutions
   Replace

    "aspect"				"32 by 9" for "aspect"		"128 by 27"

   and on

   widescreen_vertical_split

   "aspect"				"8 by 9"

   for

   "aspect"		"32 by 27" 

   Have you noticed that there are less blank spaces or dots then before? (if you are using HxD there are dots (.))
   As you can see every character counts per line, before there were 32, so if I put 128, I need to delete a blank (or dot)
   to leave the same quantities of characters, also there were 9 and now 27, so deleted one more blank space, got it?
   EVERY TIME YOU GIVE ONE MORE NUMBER OR LETTER, YOU NEED TO DELETE A BLANK SPACE(DOT FOR HxD).
   EVERY TIME YOU REMOVE ONE NUMBER OR LETTER, YOU NEED TO ADD ONE BLANK SPACE(DOT FOR HxD).
   You can change the fov and other stuff through here or through the console.
   REMEMBER, KEEP THE NUMBER OF CHARACTER THE SAME,
   IF YOU DON'T, THE GAME IS GONNA HAVE A LOT OF ERRORS.
   If you have problems with other resolution or anything else just leave a message on the topic.

[✝Joe✝]

Nevermind, I figured it out now. You can't delete a single blank space, you have to delete the entire indent. Thank you for the guide but I think that should have been made clearer.

[✝Joe✝]

changing any of these values, regardless of whether the space in the line is the same or not, completely breaks the game for me. What can I do?

[fenderjaguar]

For 3840x1080, I didn't alter "widescreen horitzontal split" at all, just vertical. And put "16 by 9", instead of "8 by 9". Same as portal 2:

https://steamcommunity.com/app/620/discussions/0/864951657900282299/?l=english