see the section Extended Color Support.
C++
The members of the DocExComment_EPSColor structure are as follows:
ident   Specifies the constant value, msodocexsignature, which identifies this EMF
comment as containing semantic information.
iComment   Specifies the MSODOCEXCOMMENT value,
msodocexcommentEPSColor.
colorInfo[]   Specifies the color information for the EPS file. The add-in should pass
this information to Publisher using the IMsoDocExporterSite::SetEPSInfo method.
The DocExComment_EPSColorCMYKJPEG structure specifies the start, in the EMF, of a
binary object that is a CMYKJPEG file stream. For more information about this structure,
see the section Extended Color Support.
C++
The members of the DocExComment_EPSColorCMYKJPEG structure are as follows:
ident   Specifies the constant value, msodocexsignature, which identifies this EMF
comment as containing semantic information.
iComment   Specifies the MSODOCEXCOMMENT value,
msodocexcommentEPSCMYKJPEG;
typedef struct
{
    DWORD ident {};
    DWORD iComment {};
    BYTE colorInfo[];
} DocExComment_EPSColor;
DocExComment_EPSColorCMYKJPEG
typedef struct
{
    DWORD ident {};
    DWORD iComment {};
} DocExComment_EPSColorCMYKJPEG;
DocExComment_EPSColorSpotImage