The error SP2-0734: unknown command beginning "´╗┐..." occurs because your SQL script is saved with a UTF-8 with BOM (Byte Order Mark) encoding. SQL*Plus does not recognize the hidden BOM characters (´╗┐) at the very beginning of the file, causing it to fail on the first line.
How can we change the default encoding to always be the ANSI

As I want to set this by default so that I dont have to keep changing the file to this encoding every time I save a file.