User would like the SQL Editor to always default to the PLSQL (*.sql, *.sql, *.frc) filter when opening a file. If user opens a subsequent file via Load From File icon, the last type of file Open is loaded as the current filter.
WORKAROUND:
Change the filter back to the default PLSQL (*.sql, *.sql, *.frc) manually.
STATUS:
Enhancement request ER# ST65951 has been submitted to Development for consideration in a future release of Toad for Oracle.