Can't edit .cfg files on Crysis with Windows 7?

I have tried to change the .cfg files in my crysis install folder for difficulty settings by adding commands like g_godmode = 1 but when i have entered this i can't save the file with the changes i get denied. I have windows 7 64 bit home Premium and i am the adminCan't edit .cfg files on Crysis with Windows 7?
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http://crysis.4thdimension.info/modules.鈥?/a>

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