file:// protocol not supported but doc says it is

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What steps will reproduce the problem?
1. MM_EXTRAS_URL='file://foo/bar'

What is the expected output? 
Mounts the local file or directory on the server in /usr/local on minimyth

What do you see instead?
/var/log/messages in minimyth:

Nov  4 05:45:05 (none) local0.info minimyth: installing extras
Nov  4 05:45:05 (none) local0.err minimyth: MiniMyth::url_mount: protocol
'file' is not supported.    

What version of the product are you using? On what operating system?
ram-minimyth-0.21.0-71

Please provide any additional information below.
http://www.minimyth.org/document-minimyth_conf.html#MM_EXTRAS

docs say file:// protocol is supported.

Original issue reported on code.google.com by matt...@gmail.com on 5 Nov 2009 at 4:56