The export dialog should remember its settings/selections.
a) Currently it always comes up with "Export to:" set to "Standard", and if a user uses PDF most of the time he has to change this every time.
b) The default export template for the currently selected mode should be pre-selected so the user can simply push the "Export" button.
The dialog now remembers the choice of export mode ("Standard"/"PDF"/"Text") and persists the current selection to the options file. When a default HTML or PDF template is configured in the preference dialog, that template will now be preselected when the appropriate export mode is active.
I have also extended the filter so that backup files (ending with the tilde character) are no longer displayed.