I think it is preferable to let the user select an encoding on the launcher's first run.
Here is the encoding option description given by OpenMW command line help.
Code: Select all
win1250 - Central and Eastern European
such as Polish, Czech, Slovak,
Hungarian, Slovene, Bosnian, Croatian,
Serbian (Latin script), Romanian and
Albanian languages
win1251 - Cyrillic alphabet such as
Russian, Bulgarian, Serbian Cyrillic
and other languages
win1252 - Western European (Latin)
alphabet, used by default