Thank you for the clarification, but from the links in your first post I already know that R2 Conv GUI has the WMP firefox plugin. I followed your links and read there, not to worry.
I have got another tweak you can integrate into the next version of you R2 Conv GUI. It's the Windows Media Player plugin for Firefox that allows you to play Windows Media content on websites that support it.
Great job. I am used to tweaking servers manually, but I'm also determined to try R2 Conv GUI next time.