Frank @Franky I apologise for not attaching my post to yours. I did a quick check but didn’t manage to turn up your post sorry! I don’t know where they (and anything else that we haven’t tripped over yet) are kept and until this release it hasn’t been a problem.
However, like some (certainly not too many) users I lost the database in the PL4 to PL5 upgrade. In my case it didn’t manner and I managed to find a copy and recovered the database but others lost data that was important and represented an investment in time and energy that they were reluctant/sorry to lose. Hence, my rant about taking backups over on Database hell between PL4 and PL5.
I added my presets to that list because although they were being backed up the schedule was not rigorous, i.e. I was being lazy = careless = disaster waiting to happen = 
(the first icon is ‘sleepy’!?).
I think that I have found the settings they are in the User.config but there is such a difference between the User.config of 5.0.2 and 5.1.0 that there is no simple way to recover them from one file to another! Beyond Compare would allow me to copy the lines across but …
There is no way of protecting the settings when they are buried in the middle of a file like this one so it is a bug and it might be nice if there was a way of saving the options so that they can be recovered in the event that this happens again @sgospodarenko.
EDIT:-
Sorry for the second time @Franky, you were right with your guess about the settings possibly being in the User.config file. I was concerned that I had jumped to the wrong conclusion above so I added 20 ‘New option’ entries to the ‘Export to disk - Options’ and did the compare again and then searched the file in HippoEdit and that showed all the items in the “single line” entry that is the ‘Output Settings’.
END EDIT:-