After the recent Windows 10 Fall Creators update, I found that my hyperlinks in Pegasus Mail (v 4.72.572) no longer open my default browser. Instead it opens Windows Explorer at the windows/system32 menu. I have tried changing the various settings in Pmail for hyperlinks.. including pointing directly the my browser exe file (FireFox). I have checked in Windows settings for defaults for browser and http and https. All point to Firefox.
Help!