JSPServlet can't load taglib class under W2K

Hello,
iAS version: 10g (9.0.4)
platform: w2k
Service Pack: sp4
I've deployed a custom application. When I try to access to the application I get the following error in the application.log:
JSPServlet: Exception: oracle.jsp.parse.JspParseException: line number 18, <%@ taglib uri="/includes/TTT_TagLib.tld" prefix="ttt" %>
Error: Unable to load taghandler class: /includes/TTT_TagLib.tld
The deploy of the same ear under Linux platform with the same iAS version ( 9.0.4 ) is working fine.
Any idea?

Hi all,
CLASSPATH in windows is D:\oracle\mtierAS10g\jre;D:\oracle\mtierAS10g\jlib;D:\oracle\mtierAS10g\jre;D:\oracle\mtierAS10g\rdbms\jlib;D:\oracle\mtierAS10g\network\jlib;
CLASSPATH in Linux is equivalent

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