You'll need to replace COUNTRY.SYS file before compiling resource files for DBCS OS/2 Warp except for the Japanese version (Refer to Files to Be Modified).
The resource compiler, RC.EXE, provides -cp command line option to specify the code page in which the source file is written, and -cc command line option to specify the country code. For instance,
rc test.rc -cp949 -cc86
The following codepage-id and country-code can be specified.
┌────────────┬────────────┬────────────┐ │Code page │Country code│Description │ ├────────────┼────────────┼────────────┤ │932/942 │81 │Japanese │ ├────────────┼────────────┼────────────┤ │949 │82 │Korean │ ├────────────┼────────────┼────────────┤ │1381 │86 │P.R.C. │ ├────────────┼────────────┼────────────┤ │950 │88 │R.O.C. │ └────────────┴────────────┴────────────┘