questions about windows-949

Dear all,

 As a newbie in this list, i am curious about why "windows-949" or "cp949" (Korean) was not
  enlisted in IANA charsets lists. As you know, "windows-949" is "KS_C_5601-1987" + some
  extended hangeul syllables + extended chineses characters , most of which
  came from KS_C_5601-1992 annex 3.

 CP949 is a superset of KSC5601, though not approved by korean gov, it became
  the defacto standard charset by the monopoly of MS Windows 95 and above.
 
Microsoft products seems to use  KS_C_5601-1987 as an alias to CP949, but it is not
correct. Instead,  MS products use "EUC-KR" for  original KS_C_5601-1987 charsets. But,
 EUC-KR is just an encoding defined on KSC5601 , and If KSC5601 is further extended,
EUC-KR should follow it, and that means EUC-KR charsets should not be fixed because
it is an open set of characters with EUC-KR-defined 2byte encoding over KSC5601 variants.

Soobok Lee