This Windows 10 PC is relatively new and didn't have WinPCAP installed, so I did that part then installed and ran HDPSDRProgrammer V2.0 .
Discovery is pretty much instant - the 200D consistently gets an address from my router, and the correct address showed up in the Discovery field. (MikroTik core router, radio is one L2 switch hop away)
I clicked the Browse button to point to the new .rbf file, and get the following:
The error message isn't correct, obviously. What I don't know is what it actually means.

Has anyone seen this before?
Thanks,
Jim N7CXI