Windows differs from most other operating systems in that most internal text strings are stored and processed as 16-bit-wide Unicode characters. Unicode is an international character set standard that defines unique 16-bit values for most of the world's known character sets.
Because many applications deal with 8-bit (single-byte) ANSI character strings, Windows functions that accept string parameters have two entry points: a Unicode (wide, 16-bit) and an ANSI (narrow, 8-bit) version.
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