Users have a Windows Folder Shortcut with a Target of \\localhost\c$\sub. When any kml or kmz file under that folder opens in Google Earth Pro, a selected placemark displays an empty description balloon. For example* this is how the clubhouse appears clubhouse with empty balloon *(from kml reference extended data example at https://developers.google.com/kml/documentation/kmlreference#extendeddata)
EDIT: Here's my file and here's a tut file that displays the similar behavior for the placemark.
This is the expected result -- clubhouse with description
This is happening with all files on Google Earth Pro 7.3.3.7786 (64-bit) [Build Date July 21,2020 PM UTC; Renderer OpenGL; Microsoft Windows (6.2.9200.0)] installed on Windows 10 Pro Version 2004, build 19041.746. EDIT: Updated to Windows 10 Pro Version 20H2, build 19042.746, yet problem persists.
I have tried all options in the Google Earth Repair tool, and recreating the windows file association. I tried changing the placemark description HTML from CDATA format to Extended Data pairs. I also tried adding the balloon visibility element to the placemark with as shown in the documentation -- <gx:balloonVisibility>1</gx:balloonVisibility>
The balloon displays properly if the kml or kmz file is opened
- from a Network Folder mapped as \\localhost\c$\sub, or
- from the "Local Drive (C:)" subfolder of "This PC"
Since my users will likely open the kml/kmz file from their File Explorer folder shortcut, is there some other way to force the HTML description to display in the balloon when opened that way?