http://bugs.winehq.org/show_bug.cgi?id=35760
--- Comment #3 from François Gouget fgouget@codeweavers.com --- You might have hit it on the head. I have rebooted the VM and re-run the tests and the failures seem to be gone:
http://test.winehq.org/data/ecd24b5a874ead368c8f6e9d6981bb0e02472f9d/win7_fg...
So it does look like I forgot to reboot the VM after changing the locale. Given that I'm updating all the other 'locale snapshots' to make sure they get a reboot.