Filetype detection on vim

Hi,

I am not getting how to add a new filetype to vim. I am on windows and I am
using vim73.

I want to add a new filetype with extention .pn. For this I had done
following:

I went to vim installation directory i.e. vim73 and I edited filetype.vim. I
added following line

au BufNewFile,BufRead *.pn setf potion

in between augroup filetypedetect and augroup END

Then I opened my vim with a file with extension .pn.
I typed following command
:set filetype?
and got answer
filetype=

Am I doing any wrong?

Please help.

Thanks
Ansuman



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