Microsoft Internet Explorer 5.01, 5.5, and 6.0 allows remote attackers to misrepresent the source of a file in the File Download dialogue box to trick users into thinking that the file type is safe to download, aka "File Origin Spoofing."
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-047
http://www.securityfocus.com/bid/5559