Under Tools-->Internet Options-->Languages, is "English (Canada) [en-ca]" the first language listed? You can have other languages set here, but if English (Canada) is not there or if Chinese or Japanese is the first language listed, I have the feeling that IE6 will default to UTF-8 as that's the most frequently used character encoding for those two languages, regardless of whether Western European is set as your default encoding (no check besides "Auto-Select").
Also, do you have any of the service packs for IE 6 installed?
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Under Tools-->Internet Options-->Languages, is "English (Canada) [en-ca]" the first language listed? You can have other languages set here, but if English (Canada) is not there or if Chinese or Japanese is the first language listed, I have the feeling that IE6 will default to UTF-8 as that's the most frequently used character encoding for those two languages, regardless of whether Western European is set as your default encoding (no check besides "Auto-Select").
Also, do you have any of the service packs for IE 6 installed?