open the subtitle with notepad++
1-find under encoding menu your charset (mine is cyrilic)
2-convert it to utf-8
3-save and enjoy your movie
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i dont know complately how it works but,
some 'media players' has included 'charset select' in subtitle font settings and it works.
mpcstar needs to include some subtitle settings and 'webm' media support.
here is 6.0.2
http://download.cometbird.com/download-all/CometBird-6.0.2.win32.en-US.20110919142051.installer.exe
or
http://tranzit.dir.bg/load.php?id=LuONJlS8d4ZLpovC1006472