Photo Downloader only shows Z6 icons

Windows 10 (1903), latest versions of Bridge and ACR. Downloader will not display images from Z6 but Bridge and converter recognize, display and process Z6 NEF files. No issues with NEF from other Nikons or Canon/Olympus raw images. Reset preferences in Bridge, did nothing. When I first got the Z6 I had no problems. I am not sure if this happened after installing the new RAW image extension for Win 10 (which I believe only works in 1903?)--file explorer now displays raw image previews.
