Precompiled ExtIO-DLL with README for Winrad/HDSDR,
supporting several new features as announced here:
https://www.rtl-sdr.com/new-updates-to-the-librtlsdr-rtl-sdr-driver-fork/
Requires rtl_tcp built from development branch of https://github.com/librtlsdr/librtlsdr, e.g.:
https://github.com/librtlsdr/librtlsdr/releases/tag/dev_2020-08-26