How to execute setup.exe using install.rdf?

Hi,

    I have created extensions to install my setup.exe using install.js
which compatible with firefox 2.0 and below version using function
execute("setup.exe", "-s", true);

Now I want create extension which will for firefox 3.0.* but
install.js does not work with firefox 3.0.*
for that install.js is replece with install.rdf.

I don't how to install or execute setup.exe using install.rdf.
Is it equivivallent option availbale in install.rdf like install.js
contains execute("setup.exe", "-s", true);

If any one has solution for this ,please provide me?

Thanks & Regards
Varsha