exe to dll conversion

Hi,
I have WPF application and is looking forward for converting it to
class library. My application uses few extrenal resourses like .png and
XML files.

Do let me know what tool can be used and what all steps should be
followed in case of using external resources in this converted dll. I
got it working but is not satisfied when using common resources like
styles and external files.

Thanks,
Mahesh