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http://www.winamp.com/help/FAQ

Does Winamp support unicode filenames and tags?
Yes, it does. Unicode support was implemented between versions 5.2x and 5.3x. Always make sure you are using the very latest version.
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真的好久沒用Winamp了...

剛剛在VM(Guest OS=XP)上灌了官網的5.581，可以正確讀取日文檔名的MP3，

也可以看到ID3 v2.4 UTF-8的標籤內容，該不會是還原回去的C_950.nls有問題，

還是有某些不支援Unicode的Plug-in在作亂...