Sorry about that.
Committed a patch to fix this. Now, if the scheme has a single letter, we assume that what we've been given is a Windows absolute file path and treat it accordingly.
Committed a fix to subversion, http://jezuk.dnsalias.net/viewvc?view=rev&revision=808
You can grab the fix from there. It'll go into the next release, which will hopefully be before the end of this month.
