pb (PCHAR) - output
This buffer area is where the system returns the requested message file list of code pages and language identifiers.
cb (ULONG) - input
pszFilename (PSZ) - input
The drive designation and path are optional. This specifies a file that was previously prepared by the MKMSGF utility program.
cbBuf (PULONG) - output
ulrc (APIRET) - returns
DosQueryMessageCP returns one of the following values: