I got a brand new PC with Windows 10. I made all the needed system updates, yesterday.
Today I installed Firestorm (x64, 220.127.116.11831). I logged in with my username and password, after checking the "Remember" box.
I went inworld and checked how it was running, making little changes to my Preferences. I set Backup/Restore Settings path to an USB key folder where I had my settings saved. I asked Firestorm to restore my settings and it replied of course it had to be restarted. Ok. Then it restarted, and displayed this message:
"We were unable to decode the file storing you