Merge pull request MicrosoftDocs#2688 from corob-msft/cr-setlocale-1468-os25216223

Fixes for issue 1469 and OS 25216223

Author: PRMerger6

docs/c-runtime-library/reference/create-locale-wcreate-locale.md

@@ -59,7 +59,7 @@ This function validates the *category* and *locale* parameters. If the category
 
 The *locale* argument is a pointer to a string that specifies the locale. For information about the format of the *locale* argument, see [Locale Names, Languages, and Country/Region Strings](../../c-runtime-library/locale-names-languages-and-country-region-strings.md).
 
-The *locale* argument can take a locale name, a language string, a language string and country/region code, a code page, or a language string, country/region code, and code page. The set of available locale names, languages, country/region codes, and code pages includes all that are supported by the Windows NLS API except the code pages that require more than two bytes per character—for example, UTF-7 and UTF-8. If you provide a code page like UTF-7 or UTF-8, **_create_locale** will fail and return **NULL**. The set of locale names supported by **_create_locale** are described in [Locale Names, Languages, and Country/Region Strings](../../c-runtime-library/locale-names-languages-and-country-region-strings.md). The set of language and country/region strings supported by **_create_locale** are listed in [Language Strings](../../c-runtime-library/language-strings.md) and [Country/Region Strings](../../c-runtime-library/country-region-strings.md).
+The *locale* argument can take a locale name, a language string, a language string and country/region code, a code page, or a language string, country/region code, and code page. The set of available locale names, languages, country/region codes, and code pages includes all that are supported by the Windows NLS API. The set of locale names supported by **_create_locale** are described in [Locale Names, Languages, and Country/Region Strings](../../c-runtime-library/locale-names-languages-and-country-region-strings.md). The set of language and country/region strings supported by **_create_locale** are listed in [Language Strings](../../c-runtime-library/language-strings.md) and [Country/Region Strings](../../c-runtime-library/country-region-strings.md).
 
 For more information about locale settings, see [setlocale, _wsetlocale](setlocale-wsetlocale.md).
 

docs/c-runtime-library/reference/setlocale-wsetlocale.md

@@ -85,7 +85,7 @@ At program startup, the equivalent of the following statement is executed:
 
 `setlocale( LC_ALL, "C" );`
 
-The *locale* argument can take a locale name, a language string, a language string and country/region code, a code page, or a language string, country/region code, and code page. The set of available locale names, languages, country/region codes, and code pages includes all those supported by the Windows NLS API except code pages that require more than two bytes per character, such as UTF-7 and UTF-8. If you provide a code page value of UTF-7 or UTF-8, **setlocale** will fail, returning **NULL**. The set of locale names supported by **setlocale** are described in [Locale Names, Languages, and Country/Region Strings](../../c-runtime-library/locale-names-languages-and-country-region-strings.md). The set of language and country/region strings supported by **setlocale** are listed in [Language Strings](../../c-runtime-library/language-strings.md) and [Country/Region Strings](../../c-runtime-library/country-region-strings.md). We recommend the locale name form for performance and for maintainability of locale strings embedded in code or serialized to storage. The locale name strings are less likely to be changed by an operating system update than the language and country/region name form.
+The *locale* argument can take a locale name, a language string, a language string and country/region code, a code page, or a language string, country/region code, and code page. The set of available locale names, languages, country/region codes, and code pages includes all those supported by the Windows NLS API. The set of locale names supported by **setlocale** are described in [Locale Names, Languages, and Country/Region Strings](../../c-runtime-library/locale-names-languages-and-country-region-strings.md). The set of language and country/region strings supported by **setlocale** are listed in [Language Strings](../../c-runtime-library/language-strings.md) and [Country/Region Strings](../../c-runtime-library/country-region-strings.md). We recommend the locale name form for performance and for maintainability of locale strings embedded in code or serialized to storage. The locale name strings are less likely to be changed by an operating system update than the language and country/region name form.
 
 A null pointer that's passed as the *locale* argument tells **setlocale** to query instead of to set the international environment. If the *locale* argument is a null pointer, the program's current locale setting isn't changed. Instead, **setlocale** returns a pointer to the string that's associated with the *category* of the thread's current locale. If the *category* argument is **LC_ALL**, the function returns a string that indicates the current setting of each category, separated by semicolons. For example, the sequence of calls
 

docs/c-runtime-library/reference/setmbcp.md

@@ -54,7 +54,9 @@ The *codepage* argument can be set to any of the following values:
 
 - **_MB_CP_SBCS** Use single-byte code page. When the code page is set to **_MB_CP_SBCS**, a routine such as [_ismbblead](ismbblead-ismbblead-l.md) always returns false.
 
-- Any other valid code page value, regardless of whether the value is an ANSI, OEM, or other operating-system-supported code page (except UTF-7 and UTF-8, which are not supported).
+- **_MB_CP_UTF8** Use UTF-8.  When the code page is set to **_MB_CP_UTF8**, a routine such as [_ismbblead](ismbblead-ismbblead-l.md) always returns false.
+
+- Any other valid code page value, regardless of whether the value is an ANSI, OEM, or other operating-system-supported code page (except UTF-7, which is not supported).
 
 ## Requirements