CHCP--Notes Requirements for using the CHCP command Before you can use the CHCP command, you must specify the location of the COUNTRY.SYS file by using the command and load the program into memory. Assigning a new character set After you assign a new character set, any program you start uses that new character set. However, any program (not including COMMAND.COM) that you started before assigning the new character set will probably attempt to use the original character set.