Lister: Encoding menu:
 
As configured for current font
The current font chosen with ANSI/Ascii/Variable option determines the used encoding.
ANSI (local codepage) (0)
Sets the encoding to the local codepage, e.g. Russian on a system where Russian has been configured as the codepage for non-Unicode programs.
ASCII/DOS (local codepage) (1)
Like ANSI, but using the local OEM (DOS) codepage.
MacOS (2) Use MacOS encoding. This doesn't seem to work on Windows 9x/ME.
Eastern Europe (1250)..
Cyrillic KOI8-R (20866)
Use the specified codepage. The number in round brackets is the code page number as used by Windows.
Other (enter code page manually)
Here you can either enter just the code page number to use it temporarily, or enter a user-defined code page name followed by the code page number in round brackets to add it to the menu. You can find the installed code page numbers by going to Control Panel - Regional and Language Options - Advanced.
Example: Cyrillic DOS (866)