Test env: winxp, jre7 b145
test machine rdp info:
10.133.132.227
 user: tester
 pass: dtf_test

1) launch the following app by
javaws http://sqeweb.sfbay.sun.com/jsn/users/fred/master_run/deployment/src/plugin/Decoration/Decoration/html/DefaultDecorationJnlp.jnlp
It should be an installed app
2) accept to create desktop shortcut
3) execute javaws -clearcache, if cache file is deleted, bug is reproduced.