added a comment - - edited
Now, it can not be work well with all of options.
And, please check "null_passwd.PNG" file.
It is shown password on the dialog.
Please replace **** with passwords on the dialog.
When exporing file, it should be exported real password.
If some parameter is null, it is also shown the null string on the dialog.
Please check "ext_list.PNG" file.
It is shown as .txt, *.xls, *.xlsx, *..
But, I think it should be ordered as follows.
.xls, *.txt, *.
And it has not different between *.xlsx and *.xls, please remove *.xlsx options.