The Code Page Detection branch under Configuration - File Handling has the following options:
Auto Code Page Detection
This setting forces the editor to evaluate if the content of the active file should be displayed with a code page other than the system default code page.
Prompt to accept code page (If not checked accepts highest rated match)
This setting is only active when Auto Code Page Detection is enabled. If this option is selected and the editor detects that a new code page is required, a dialog will be presented where the user may select the code page to be used for the active document. If this is not selected, but Auto Code Page Detection is enabled the highest rated matching code page will automatically be used.
Prompt to change font and script if different from default system code page
If this option is selected and a new code page is selected that requires a different font and script for proper display a dialog will be displayed to prompt this change.
When converting from Unicode to ASCII always use system default code page
If this option is not selected and a document is converted from Unicode to ASCII a dialog will be presented for the user to select the code page to change to as Unicode and ASCII files require different code pages. If this is selected, the system default code page will be used for the conversion.