Code page 951 explained

Code page 951 is a code page number used for different purposes by IBM and Microsoft.

• IBM uses the code page number 951 for their double-byte PC Data KS code,^[1] the double byte component of their code page 949, an encoding for the Korean language. See Code page 949 (IBM).
• The code page number 951 was also used by Microsoft as part of a kludge for providing Hong Kong Supplementary Character Set (HKSCS-2001) support in Windows XP, in the file name of a replacement for code page 950^[2] (Traditional Chinese) with Unicode mappings for some Extended User-defined Characters (EUDC) found in HKSCS. HKSCS characters without a Unicode mapping are assigned a Unicode Private Use Area (PUA) code point following previous practices. The IBM code page number for Big5 with HKSCS-2001 is 5471.^[3] See Hong Kong Supplementary Character Set § Microsoft Windows.

Notes and References

1. Web site: CCSID 951 information document. https://web.archive.org/web/20160327100212/http://www-01.ibm.com/software/globalization/ccsid/ccsid951.html. 2016-03-27.
2. Web site: Steele. Shawn. CP 951 & HKSCS. I'm not a Klingon. MS Dev Blog. 13 September 2016. https://archive.today/20170309020320/https://blogs.msdn.microsoft.com/shawnste/2007/03/12/cp-951-hkscs/. 2017-03-09.
3. Web site: https://web.archive.org/web/20141129233053/http://www-01.ibm.com/software/globalization/ccsid/ccsid5471.html. 2014-11-29. dead. Coded character set identifiers  - CCSID 5471. IBM Globalization. IBM.