I use IE 6 as my default browser. I use the below command to ensure that a new IE browser window is open with the web page I have defined in the parameter setting.
Program Launch: "IEXPLORE.EXE"
<LAUNCHDEL2:0:01C:\Program Files\Internet Explorer\IEXPLORE.EXE<PARAM>http://www.google.com/advanced_search>
If you are using a different browser, as long as it as you can launch it with the appropriate parameter, it should work also.