ITunes corrupts ID3v2 tags in mp3

First - I couldn't find any form for a bug report on this site, so I'm using this forum. If it is wrong please feel free to redirect me to correct place.
Well, the story is the following: I've tried to add a directory with it's subdirectories containing mp3's to playlist, but iTunes found only 30% of all files! Okay, I have the winamp's .m3u list of the same directory and iTunes can import it(at least there's such menu item). After I've opened m3u in iTunes it showed all the songs with national(Russian) letters in their name as <-)-< e.g. it doesn't understand this characters(winamp's m3u list is stored in plaintext, not in the unicode). After I've tried to play some of these mp3's their names displayed right. Great, I've started to play all these mp3's with "bad" names to correct them. I've uploaded them to iPod and was happy. Till I've launched winamp again. It showed all the songs names as giberish! And notice, only song names, artist name and album remained the same. I've found that iTunes replaced all the names in ID3v2 tags with their unicode variant! Why??? I really don't understand this. And I didn't found any checkbox like "don't corrupt my id3 tags".
What I need now is to return my tags to their previos state. I think that iTunes developers should 1)fix this bug 2)write an utility to restore the tags (it is their fault that the tags were corrupted).
Thanks for reading.
Waiting for response from developers.
--ss

I should have been said that I'm using iTunes for windows.
And this link http://www.apple.com/feedback/itunes.html leads to the "Request Music" page.
I know that "plaintext" is not an encoding(the real encoding of my m3u is win1251), I've just tried to say that winamp's playlist is not in unicode.
Okay, unicode is great. But why it converted only song's title, but not artist or album name?
I still would like to hear answers to my questions:
1. why iTunes skipped a lot of mp3's when I've tried to add a whole directory with it's subdirectories?
2. why it converts only song's name and not the reset?
3. will they publish some utility to recover id3 tags? (it is not hard to write such a programm)

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ITunes corrupts ID3v2 tags in mp3

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