Since Toad version 16.0, the encoding is no longer taken into account when opening a file.
Please resume this !!!
We have emense problems when running scripts in SQL Plus if files are not saved in UTF 8 (without BOM).
This happens since version 16.0 unfortunately often because when opening and then closing a file the encoding, see Toad options Files / General is no longer taken into account.
Picture of Toad Version 14.*: