Can not find java file in com.sap.portal.navigation.detailedtree.par.bak

Hello

Goal: want to change something in Detailed Navigation.

I got com.sap.portal.navigation.detailedtree.par.bak from ROOT/WEB-INF/deployment/temp

import it in NWDS. But There is no single java file.

I expected to change java file or JSP file.

NWDS 7.0.09

Netweaver 7.0

Thank you...