If you changed your computer and want “your PL/SQL developer login history and preferences” as well in your new computer. Copy the following folder to your new computer in the same path format!
If you need only the login history, open the following file:
In the file, copy [LogonHistory] part to your new user.prefs file. It’s encrypted but it does not matter. PL/SQL Developer will dencrypt it
I need this, because I deal with a lots of database with a lots of schema.. It is really hard to remember the passwords sometimes, so i let the PL/Developer to remember them (Preferences > Login History > Store with Password)