https://bugs.winehq.org/show_bug.cgi?id=43557
--- Comment #2 from Alter alter@ukr.net --- In practive, there are standard CP866 with Short-U on f6/f7 and CP866ukr with Cyrilic I/i on the same places used be several non-unicode software with Ukrainian localization. Maybe it worth adding other NLS codepage (e.g. 10866) for proper localization of such software. 866ukr is mentioned in https://uk.wikipedia.org/wiki/CP866#.D0.92.D0.B0.D1.80.D1.96.D0.B0.D0.BD.D1.... (unfortunately, english version is not full)
Another possible solution is translation of Unicode Ukrainian I/i into English I/i