How to resolve CSS Validation Error - Property behavior doesn't exist

Hi All,

When I try to validate my css I keep getting the following error:

Property behavior doesn't exist : url(iepngfix.htc) url(iepngfix.htc)

Sample files attached (PNG Issue 13Nov10.rar)
Main contents -
inner Page_version2.html - HTML file where the css is being called
\stylesheet\IEFix.css - css file (check line number 182: .artist-title-newbg)
iepngfix.htc - png fix file for IE 6.0
readme.txt

I need to fix this error as soon as possible as my designs do not work without this png fix.

I am using the following link for CSS validation:

http://jigsaw.w3.org/css-validator/#validate-by-upload

Any solution would be highly appreciated.

Thanks in advance.
 IEFix.css iepngfix.txt read-me.txt inner-Page-version2.html