File Upload Problems with IE 4.01
Problem: When uploading a file to IIS Web server using Microsoft's NTLM authentication and IE 4.01, you may receive a CFFILE error message: "The multi-part boundary marker is not present in the posted data". There is a bug in IE 4.01 where the file form variable doesn't get passed in the header information.
Solution: This URL leads to a workaround.
File Upload Problems with IE 4.01