Thanks Walter. I tried, successfully, to do this on my 740b and it worked, but it was very, very jerky and slow to catch up. So, I got the idea to copy the ADS-B bin file (Adsb_2020_02_25-11.29.bin, 2/25/2020 1:23 PM) from my 740b to my Windows, and replay it on my Windows instance of iFlyGPS.
The good news is that once I put the file where it belonged, the Windows instance saw it (and others I didn't know I had) and let me play it.
But..... When I replayed the ADS-B file on the 740b, I saw targets and other ADS-B related info. When I did the same on the Windows instance, I saw my aircraft and it's track, but none of the ADS-B targets showed up.
In the image below, I've got, at the top, the screen of the 740b showing several ADS-B targets... the bottom part of the image is a capture from my Windows instance, at almost exactly the same point in the file, but it shows none of the ADS-B targets. Am I missing a file? I tried to get all the log files. So what am I doing wrong? How do I transfer all the info from the 740b to Windows???