UTF-8 encoding for server variable PATH_INFO

I have a cgi application that uses PATH_INFO and expects it to be utf-8
encoded. In IIS 5 it worked fine. It seems that in IIS6 and 7, PATH_INFO gets
encoded to the local code page. Is there any way to keep the utf-8 encoding?
Or is there another way to achieve the same effect?

Working with IIS6 on Windows Server 2003.

Thanks in advance,
-John