Simplified Chinese Character Encoding

[Patrick]

I have an ASP file that is saved as an ANSI file (when you open it up in
notepad) with <meta http-equiv="Content-Type" content="text/html;
charset=GB2312">

However, when I try to validate the ASP page with http://validator.w3.org, I
get a failure:
Sorry, I am unable to validate this document because on line 64, 34 it
contained one or more bytes that I cannot interpret as gb2312 (in other
words, the bytes found are not valid values in the specified Character
Encoding). Please check both the content of the file and the character
encoding indication

However, I have visually examined the page displayed when loaded in Internet
Explorer 5+ and all the Chinese characters displayed are correct.

How could I set about getting my page passing the W3C markup validation?