Making an application compatible with MBP Retina Display

Hi guys. I have a game that I really enjoy playing, "Football Manager 2012", which isn't optimised for retina and looks blurry/pixelly on the new MBPR screen. Its native resolution is 1280x800, but it can be changed up to 2560x1600, and although that makes the text crisp, it is tiny and you can barely read anything, as you would imagine.

I have tried every "hack" under the sun to make it Retina-compatible.
In the info.plist of the application, I added this line of code to make the app supposedly support Retina fonts (it's all I care about -- don't mind the graphics).

Code:

<key>NSPrincipalClass</key>
<string>NSApplication</string>
<key>NSHighResolutionCapable</key>
<true/>

I added that code to all three instances of the app (two in applications folders, one buried deep in the Steam directory). I even applied the code to the Steam application just in case that was the offender. I rebuilt the apps' plist cache using the copy-paste method for all of this. I ensured that the "open in low resolution" checkbox was unticked. Supposedly this would work -- no dice.

These tricks work with other applications, so why not this?

Then I tried an OS-wide line of code in Terminal to force apps to untick "open in low resolution". Still not working.

My next effort was trying to edit the xml settings of the Football Manager application itself. I found the xml file and where it has the font sizes. I download all four OTF font files that are used in the game, so the computer 'possesses' a retina-capable font to utilise. There was also a line called "lcd_filter" and it was using "freetype" (don't know what that is). I didn't touch anything else in the xml.

I'm not sure what more I can do.... it's really ticking me off. I know nothing has worked because the grey title bar of the application (in windowed mode) is still pixelated and has blurry traffic light buttons. Everything is still "non-retina".

Please help me, MacRumors!

 

Sorry. Have I posted in the wrong forum? Or is this just a really tough problem?