[python-win32] How to unload ShellExtension?

[aurora]

I have previously asked about how to reload a ShellExtension during  
development. There a a few good suggestions like killnig the explorer  
process. Now I run into a bigger issue. When I uninstall (using  
innosetup), the process is still loaded and it lock up scores of DLLs.  
Killing explorer is probably too heavy handed for end users. So let me try  
one more time, is there anyway to positively tell explorer to unload a COM  
server?

Thanks,

wy