virtual overlay for macintosh

my ass is getting kicked.  my mac hates working with the multi-gigabytes
of picture and movie data that i already have and is happily being
exported via sfs.  the problem is that my mac only wants to see pictures
ending in extensions it likes (e.g. ".jpg", ".mov", etc.).

is there any magical way of causing the virtual file system overlay to
do that magic for me?  i hope it'd be fairly simple to write a virtual
file system overlay on linux to perform the 'file' logic to add extensions
for me.

is there some kind of magic option or easily installed magic option to
do this for me?

-- 
Mark Smith
[email protected]
mark at tux dot org
nova-instructor at tux dot org