Some users might experience Foxit PDF Editor reverting as a default PFD handler after each reboot, even if other application is set as a default PDF handler.
If you run in to this issue please follow the steps below:
1. Check if "C:\Program Files (x86)\Foxit Software\Foxit PDF Editor\phantom_sl.exe" (path may vary depending on your installation folder)
Explanation for phantom_sl.exe: This file is started at each boot/reboot and sets Foxit PDF Editor as a default, which overwrites any previous setting that the user has chosen.
It uses the following Registry entry to run:
"Phantom_Sl"="C:\\Program Files (x86)\\Foxit Software\\Foxit PDF Editor\\phantom_sl.exe DefaultReader"
2. If it exists, simply rename it or delete it. (use a simple batch script to delete it, see below)
Note: deleting this files does not cause any harm or issues with Foxit PDF Editor
From an elevated Command Prompt run the following command:
del "C:\Program Files (x86)\Foxit Software\Foxit PDF Editor\phantom_sl.exe"