VI Editor Help Please!

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http://www.linuxforums.org – Please forgive me if I am not posting this is the correct forum. I am extremely new at this, so please bare with me as I try to explain my problem. At work we are using Cisco Voip phones and when setting them up we first create a config file in vi editor. I first use a program called putty. I signed into the program and typed vi filename..cnf to edit a config file, well I accidently exited out of the program before typing the command in vi to quit (I know I am an idiot). Anyways I go back into putty and the vi editor and type command vi filename.cnf and the warning message i have highlighted (HowTos)