Well, i had a problem changing arma key without reinstalling the whole game since cdkey is encoded in registry and i did not find any solution, so i took installer, reversed it a little bit and coded cdkey changer for arma2:oa, it will decode and display your current key and you can enter new key to update old one.

It can be helpful for those who was banned with steam version and dont wanna change account, so you can buy new key somewhere else and change it, iam not sure, but as i know BE should only ban OA key.

It should work on both 32 and 64bit, it can require vcredist_x86.exe
, but most of you, should already have it installed.

You must run it as administrator (it should ask for it) on vista/w7, or it will not be able to change key value. but if you dont want, it will display converted hex-key and you can manually change key here:

HKEY_LOCAL_MACHINE\\SOFTWARE\\Wow6432Node\\Bohemia Interactive Studio\\ArmA 2 OA\\key

for 64 bit systems and for 32bit

HKEY_LOCAL_MACHINE\\SOFTWARE\\Bohemia Interactive Studio\\ArmA 2 OA\\key

its REG_BINARY.

iam not going to pack it, so it should not have any problems with AV software.
and you can also use it if you lost your key but it is still in registry.

http://i.imgur.com/GN7wc.png

http://www.img.olgh.net/download.gif

http://www.dl4.olgh.net/index.php?act=dl&id=1350900215

Credits: AssassinS

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