http://bugs.winehq.org/show_bug.cgi?id=32052
--- Comment #2 from Hans Leidekker hans@meelstraat.net 2012-10-24 15:15:02 CDT --- The "[~]np" format denotes a string with an embedded null. It is parsed correctly but the result is not preserved because pretty much all our code assumes that strings are regular zero-terminated strings.
I'll work on some patches.