This seems to be a simple bug only if someone who has experience in
treating correctly utf-encoded strings looks at it. Ganesh? Ben?
See
http://hub.darcs.net/darcs/darcs-screened/browse/src/Darcs/UI/Commands/Convert.hs#536
:
These Filenames come from `listTouchedFiles`, then are passed to
`dumpFiles`, which outputs them to the fast-export stream, that's all.