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{{hatnote|This is Microsoft's Code Page 932 and IBM's Code Page 943. For IBM's Code Page 932, see [[Code page 932]].}}
'''Microsoft Windows code page 932''' ('''Windows-932''' or [[Code page 932|ambiguously]] '''CP932'''), known by IBM as '''[[code page]] 943''' ('''CP943''')<ref>{{cite web | url=http://www-01.ibm.com/software/globalization/ccsid/ccsid943.html | title=Code Page 943 | publisher=IBM}}</ref> and known by the [[Internet Assigned Numbers Authority|IANA]] as '''Windows-31J''',<ref name="iana31j">{{cite web | url=https://www.iana.org/assignments/character-sets/character-sets.xhtml | publisher=IANA | title=Character Sets}}</ref> also called '''MS-Kanji''',<ref>{{cite web | url=https://docs.python.org/3.6/library/codecs.html#standard-encodings | title=7.2.3. Standard Encodings | publisher=Python Software Foundation | work=Python 3.6 Documentation | accessdate=19 September 2017}}</ref> is Microsoft's extension of [[Shift JIS]]. It contains standard 7-bit [[ASCII]] codes, and Japanese characters are indicated by the high bit set to 1. Some code points in this page require a second byte, so characters use either 8 or 16 bits for encoding. It is a combination of [[Code page 897]] and [[Code page 941]].
The "Windows-31J" name is IANA's and not recognized by Microsoft, which has historically used "shift_jis" instead. In Japanese editions of Windows, this code page is referred to as "ANSI", since it is the operating system's default 8-bit encoding, even though [[ANSI]] was not involved in its definition.
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== Differences from standard Shift JIS ==
Windows-31J is often mistaken for standard Shift JIS: while similar, the distinction is significant for computer programmers wishing to avoid [[mojibake]]. In addition to the standard [[JIS X 0201]]:1997 and [[JIS X 0208]]:1997 characters, it includes "NEC special characters (Row 13), NEC selection of IBM extensions (Rows 89 to 92), and IBM extensions (Rows 115 to 119)".<ref name="iana31j" /> Such "formerly proprietary extensions from IBM and NEC", while not part of the JIS standards, were included in the [[W3C]]/[[WHATWG]] encoding standard used by [[HTML5]].<ref>{{cite web | url=https://encoding.spec.whatwg.org/#indexes | title=5. Indexes | publisher=WHATWG | work=Encoding Standard}}</ref>
Windows-31J includes standard 7-bit [[ASCII]] codes for single-byte sequences with the high bit set to 0. Hence, codes 0x5C and 0x7E are mapped to U+005C REVERSE SOLIDUS (<code>\</code>) and U+007E TILDE (<code>~</code>), as they are in ASCII ([[ISO 646|ISO-646]]-US).<ref>{{cite web | url=http://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WINDOWS/CP932.TXT | title=CP932.TXT | publisher=Unicode Consortium}}</ref> This is often a source of confusion because in many Japanese fonts, this code is displayed as a [[JPY|Yen]] symbol, which would normally be represented as U+00A5 YEN SIGN (<code>¥</code>) in Unicode. This stems from the fact that 0x5C is mapped to U+00A5 in [[Code page 895|ISO-646-JP]] and consequently [[JIS X 0201]], of which standard [[Shift JIS]] is an extension. However, code 0x5C in Windows-31J behaves as a reverse solidus (backslash) in all respects (e.g. in [[filename|file paths]] on Windows systems) other than how it is displayed by some fonts.
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