https://bugs.winehq.org/show_bug.cgi?id=45753
--- Comment #5 from Rosanne DiMesio dimesio@earthlink.net --- (In reply to Dmitry Timoshkov from comment #4)
I guess that the same incompatible change would happen during the Windows XP to Windows 7 upgrade.
I imagine you're right, but both the wineprefixes in question were set to XP and I did not change that. Forced upgrades did not come to Windows until Windows 10.