svn co of file ending in % doesn't work

Trying this command fails:

% svn co http://svn.orcaware.com/repos/tags/orca/0.15/
A 0.15/Makefile.in
A 0.15/INSTALL%
svn: RA layer request failed
svn: could not checkout a file
svn: GET of /repos/!svn/bc/150/tags/orca/0.15/INSTALL%25 returned
status code 400 (Bad Request)

You can see the INSTALL% file in the listing of
http://svn.orcaware.com/repos/tags/orca/0.15/

Any ideas? I'm using apr/apr-util/httpd2 from 2002-11-05 and
svn rev 3662.

I know this used to work, but it's been a while since I've checked
out this code, so I have no idea when it stopped working.

Best,
Blair

-- 
Blair Zajac <blair@orcaware.com>
Web and OS performance plots - http://www.orcaware.com/orca/
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