Solution : https://service.sap.com/sap/support/notes/84433 (SAP Service marketplace login required)
Key words : 
1 nt server japanese korean chinese multibyte codepage reason, instance supporting korean codepage environment, contgain language supportfor simplified chinese, process s-chinese data, /general/r3server/abap/note, instance supporting japanese, support multiple codepage environments, multiple codepage environments, 0 support multibyte character, additional application dialog instances
Related Notes : 
       
| 81323 | INST: 3.1G R/3 Inst. Japanese on Windows NT | 
| 39763 | setlocale on Windows/NT and table TCP0C |