[[Microsoft]] uses two main groups of '''code pages in Windows''' (known as [[character encodings]]s in other operating systems). The [[original equipment manufacturer|OEM]] [[code page]]s are used in console windows and can be considered a hangover from [[DOS]] and the original [[IBM PC]] architecture. The [[ANSI]] code pages are used for non-[[Unicode]] apps in the [[Microsoft Windows]] [[graphical user interface|GUI]]. Two single-byte, fixed-width code pages (874 for [[Thai language|Thai]] and 1258 for [[Vietnamese language|Vietnamese]]) and four multibyte [[CJK]] code pages (932, 936, 949, 950) are used as both ANSI and OEM code pages. Both ANSI and OEM code pages are [[extended ASCII]] code pages.
Code page 1258 uses [[combining diacritic]]s as Vietnamese requires more than 128 letter-diacritic combinations. This is in contrast to [[VISCII]], which replaces some of the [[C0 and C1 control codes|C0]] control codes.
