Windows-1252
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Windows-1252
Windows-1252
Windows-1252-infobox.svg
MIME / IANAwindows-1252
Language(s)English, various others
Created byMicrosoft
StandardWHATWG Encoding Standard
Classificationextended ASCII, Windows-125x
ExtendsISO 8859-1 (excluding C1 controls)
Transforms / EncodesISO 8859-15

Windows-1252 or CP-1252 (code page 1252) is a single-byte character encoding of the Latin alphabet, used by default in the legacy components of Microsoft Windows for English and some other Western languages (other languages use different default encodings).

It is probably the most-used 8-bit character encoding in the world. As of October 2019, 0.5% of all web sites declared use of Windows-1252,[1][2] but at the same time 2.9% used ISO 8859-1 (0.7% of top-1000 websites),[1] which by HTML5 standards should be considered the same encoding,[3] so that 3.4% of web sites effectively used Windows-1252.

Details

This character encoding is a superset of ISO 8859-1 in terms of printable characters, but differs from the IANA's ISO-8859-1 by using displayable characters rather than control characters in the 80 to 9F (hex) range. Notable additional characters include curly quotation marks and all the printable characters that are in ISO 8859-15 (at different places than ISO 8859-15). It is known to Windows by the code page number 1252, and by the IANA-approved name "windows-1252".

It is very common to mislabel Windows-1252 text with the charset label ISO-8859-1. A common result was that all the quotes and apostrophes (produced by "smart quotes" in word-processing software) were replaced with question marks or boxes on non-Windows operating systems, making text difficult to read. Most modern web browsers and e-mail clients treat the media type charset ISO-8859-1 as Windows-1252 to accommodate such mislabeling. This is now standard behavior in the HTML5 specification, which requires that documents advertised as ISO-8859-1 actually be parsed with the Windows-1252 encoding.[3]

Historically, the phrase "ANSI Code Page" was used in Windows to refer to non-DOS encodings; the intention was that most of these would be ANSI standards such as ISO-8859-1. Even though Windows-1252 was the first and by far most popular code page named so in Microsoft Windows parlance, the code page has never been an ANSI standard. Microsoft explains, "The term ANSI as used to signify Windows code pages is a historical reference, but is nowadays a misnomer that continues to persist in the Windows community."[4]

In LaTeX packages, CP-1252 is referred to as "ansinew".

Character set

The following table shows Windows-1252. Each character is shown with its Unicode equivalent based on the Unicode.org mapping of Windows-1252 with "best fit".[5]

  Letter   Number   Punctuation   Symbol   Other  Undefined   Differences from ISO-8859-1

According to the information on Microsoft's and the Unicode Consortium's websites, positions 81, 8D, 8F, 90, and 9D are unused; however, the Windows API MultiByteToWideChar maps these to the corresponding C1 control codes. The "best fit" mapping documents this behavior, too.[5]

History

  • The first version of the codepage 1252 used in Microsoft Windows 1.0 did not have positions D7 and F7 defined. All the characters in the ranges 80-9F were undefined too.
  • The second version, used in Microsoft Windows 2.0, positions D7, F7, 91, and 92 had been defined.
  • The third version, used since Microsoft Windows 3.1, had all the present-day positions defined, except Euro sign and Z with caron character pair.
  • The final version listed above debuted in Microsoft Windows 98 and was ported to older versions of Windows with the Euro symbol update.

OS/2 extensions

The OS/2 operating system supports an encoding by the name of Code page 1004 or "Windows Extended". This mostly matches code page 1252, with the exception of certain C0 control characters being replaced by diacritic characters.

  Differences from Windows-1252

MSDOS extensions [rare]

There is a rarely used, but useful, graphics extended code page 1252 where codes 0x00 to 0x1f allow for box drawing as used in applications such as MSDOS Edit and Codeview. One of the applications to use this code page was an Intel Corporation Install/Recovery disk image utility from mid/late 1995. These programs were written for its P6 User Test Program machines (US example [8]). It was used exclusively in its then EMEA region (Europe, Middle East & Africa). In time the programs were changed to use code page 850.

See also

References

  1. ^ a b "Historical trends in the usage of character encodings, October 2019". Retrieved .
  2. ^ "Frequently Asked Questions".
  3. ^ a b "Encoding". WHATWG. 27 January 2015. sec. 5.2 Names and labels. Archived from the original on 4 February 2015. Retrieved 2015.
  4. ^ Wissink, Cathy (5 April 2002). "Unicode and Windows XP" (PDF). Microsoft. p. 1. Archived (PDF) from the original on 4 February 2015. Retrieved 2015.
  5. ^ a b "Unicode mappings of Windows-1252 with 'Best Fit'". Unicode. Archived from the original on 4 February 2015. Retrieved 2015.
  6. ^ "Code Page 01004" (PDF). IBM. Archived from the original (PDF) on 2015-07-08. (version based on Windows 3.1 version of Windows-1252)
  7. ^ Borgendale, Ken (2001). "Codepage 1004 - Windows Extended". OS/2 codepages by number. Archived from the original on 2018-05-13. Retrieved . (version based on current version of Windows-1252)
  8. ^ "PERFORMANCE OF NASA EQUATION SOLVERS ON COMPUTATIONAL MECHANICS APPLICATIONS" (PDF). NASA.

External links


  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.

Windows-1252
 



 



 
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