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This option causes the compiler to recognize double-byte characters in
strings.  When the compiler scans a text string enclosed in quotes ("), it
will recognize the first byte of a double-byte character and suppress
lexical analysis of the second byte.  This will prevent the compiler from
misinterpreting the second byte as a "\" or quote (") character.

zk, zk0
    These options cause the compiler to process strings for Japanese
    double-byte characters (range 0x81 - 0x9F and 0xE0 - 0xFC).  The
    characters in the range A0 - DF are single-byte Katakana.

zk1
    This option causes the compiler to process strings for Traditional
    Chinese and Taiwanese double-byte characters (range 0x81 - 0xFC).

zk2
    This option causes the compiler to process strings for Korean Hangeul
    double-byte characters (range 0x81 - 0xFD).

zkl
    This option causes the compiler to process strings using the current
    code page.  If the local character set includes double-byte characters
    then string processing will check for lead bytes.

The macro __SW_ZK will be predefined if any "zk" option is selected.