http://bugs.winehq.org/show_bug.cgi?id=58452
--- Comment #3 from ApertureUA pidor1977@duck.com --- The example I showed is from an installer with a promotional addon section that is written in a specific 8-bit codepage but is read back using system default 8-bit codepage.
Most encodings of the same alphabet are very similar in nature, so I would expect Russian text read in a Ukrainian codepage be legible with minor changes like the letter є being swapped out for ґ. Meanwhile I would expect ru_UA to behave identically to ru_RU. What I am saying is that this locale<>codepage correlation doesn't seem to be fully mapped out yet.