If it's possible, how do you change the crosshair colour of the weapons? I find it a little difficult to target with current crosshair (eg, grenade launcher) as it blends in with the background making it difficult to see.

Edit the RGB values in the relevant file.
:AW
*:\Program Files\Ubisoft\Ghost Recon Advanced Warfighter\Settings\profiles\graw_profile_yourtag\profile.xml

<ret_color value="255 0 0" />  

:AW2
*:\Program Files\Ubisoft\Ghost Recon Advanced Warfighter 2\Settings\profiles\yourtag\settings.xml

<ret_color value="255 0 0" />  

(Win XP)

Check out this website for your number, color codes to use. Make sure you scroll down to see all of the colors.

http://users.rcn.com/giant.interport/COLOR/ColorSpecifier.html

If you are running on Vista the .xml file to edit is in your user\appdata\local\GRAW2\settings\profile\your profile name

Thanks everybody for your replies. Does this also apply to GRAW2, I.E. CHANGING THE FILES?