You have to add the command to the extension of the shortcut or exe you run the game from. Just right click and select properties.
Example,
"C:\Program Files\EA Games\Battlefield 2142\BF2142.exe" +widescreen 1 +szx 1680 +szy 1050
Example,
"C:\Program Files\EA Games\Battlefield 2142\BF2142.exe" +widescreen 1 +szx 1680 +szy 1050
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