[COD4] Account system problem

[hoek]

Hello
Me and my friend started cod4 modding and we want to create an account system first.
(We have got our cod2 mod what have got account system , and we try to use that)
But we have got a problem and we cant solve that
We use openfile for the account creating and load but always get this error for the openfile

f=openfile(self.loginname+".cfg","write");