Getting gnuradio to use zadig to connect to rtl-sdr in Windows

Hello All,

I have recently been playing with making a mingw w64 build of
gnuradio. I had some difficulties at the beginning getting it to
work, but it now does. I can connect to my pluto sdr and make a
flowgraph of a radio and execute it.

Unfortunately, the rtl-sdr is a different story. It does work through
zadig with radioconda, but it does not with my mingw w64 build. If
anyone has hints as to why it doesn't work and how to fix it, please
let me know.

Thanks in advance,

Chris