Platform: Windows 7 Home Premium
PL/SQL Developer: 8.0.4.1514

Every time I clear out Temporary Windows files and such, my PLD preferences are deleted as well. Since you can't expect MS to change the iratic Windows behaviour, isn't it possible to store user preference files within the PLD directory structure?

PL/SQL Developer preference files are stored in the user's application data directory (e.g. C:\Users\Marco\AppData\Roaming\PLSQL Developer). This directory should never be cleared.

However, you can use the prefpath=<directory> directive in the params.ini file in the PL/SQL Developer installation directory to overrule this.