FormatMessage returns a value, of type DWORD, which contains the number of bytes actually stored in the output buffer, excluding the terminating null character. It returns 0 if an error has occurred. Extended error status is available via the GetLastError API.
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Message Compiler - An Overview
Message Compiler - Syntax
Message WinAPI Calls
Parameters for Message Win32
API Calls
MKMSGF - Make Message File
Utility
MKMSGF - Syntax