+x+xHow do you "check logs", from within one of the applications (which?) or from some Finder/Explorer window? I may that assignments from the operating systems are used for routing in your setup and then it is a misrouted linkage outside of Skydemon.
There is a "Logs" up in the menu, when you click on it it is opening and shows you, your Flights. And on the "Logs, there are: Export, Merge and View on Google Earth" when you click on View on Google Earth, that happens.
I would hazard a guess that "Navigraph Charts 5" is set as the default program to open KML files.
As a bit of a test, you could try clicking "Export" and then save the log as a "Google Earth File" which will save the data as a KML file, you can then double click this file and if it opens in Navigraph Charts then you have KML files set to open with that by default, as a workaround you can open google earth manually and then click "File > Open" and select the file you saved earlier.
To change the default programs in Windows 10 permanently have a look in Start > Settings > System > Default Apps > Default programs by file type (link at the bottom of the window) and scroll down until you find ".KML" on the left, look across from this and click the app listed, you should then be able to select Google Earth to open that file type.
I don't know if its possibly for SkyDemon to override your windows defaults and specify which program it tries to open the file with, but someone may be along that knows how to do this!
Ash