Opening file as arbitrary type

Hi,
I'm trying to open a nar file with vim. When I open zip files, vim
gives me a nice view of all the files, where I can view any of the
entries in the zip file. Is there some way I can give a command line
argument to vim to tell it to treat file foo.bar as a zip file? After
opening up the nar file, I tried doing :set filetype=zip, but that
didn't work either. Is there some command I can issue after the file
is opened to treat the buffer contents as a viewable zip file?

Thanks,
Ven

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