Internet Explorer 5 HTTP 500 Error on Ampersand entity in Query String

I’ve got zillions of 500 errors in my log files (well, a handful each day). All are from Internet Explorer 5 on Windows NT (specifically the User-Agent is “Mozilla/4.0+(compatible;+MSIE+5.0;+Windows+NT)”. I’m pretty certain that the problem is ampersand character entities in anchor tag href attributes. It seems that IE5 is barfing on & being used in querystrings rather than just an ampersand. But of course the W3C’s HTML validator won’t have anything but the character entity without telling me off. Is there an answer?

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