Trying to launch applications from Vim

Hi,
I'm using NERDTree as a file browser in VIM. One of the things I would like
to be able to do is have another application open when the file cannot be
viewed by vim. I'm almost there. I added lines like this to my .vimrc:

au BufReadCmd *.doc !abiword <afile>

now when I select a .doc file in NERDTree it is opened up in abiword. One
issue I have with this is that a buffer is also opened up, and if I write
that buffer it erases my original .doc. I'm worried that I may end up doing
this accidentally at some point (it would be like me). Is there any way to
avoid the buffer opening?

Thanks Andy
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