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#pragma pack( push )
#pragma pack( 2 )
typedef struct 
{
   WORD            idReserved;   // Reserved (must be 0)
   WORD            idType;       // Resource type (1 for icons)
   WORD            idCount;      // How many images?
   GRPICONDIRENTRY   idEntries[1]; // The entries for each image
} GRPICONDIR, *LPGRPICONDIR;
#pragma pack( pop )

#pragma pack( push )
#pragma pack( 2 )
typedef struct
{
   BYTE   bWidth;               // Width, in pixels, of the image
   BYTE   bHeight;              // Height, in pixels, of the image
   BYTE   bColorCount;          // Number of colors in image (0 if >=8bpp)
   BYTE   bReserved;            // Reserved
   WORD   wPlanes;              // Color Planes
   WORD   wBitCount;            // Bits per pixel
   DWORD   dwBytesInRes;         // how many bytes in this resource?
   WORD   nID;                  // the ID
} GRPICONDIRENTRY, *LPGRPICONDIRENTRY;
#pragma pack( pop )

// Load the DLL/EXE without executing its code
hLib = LoadLibraryEx( szFileName, NULL, LOAD_LIBRARY_AS_DATAFILE );
// Find the group resource which lists its images
hRsrc = FindResource( hLib, MAKEINTRESOURCE( nId ), RT_GROUP_ICON );
// Load and Lock to get a pointer to a GRPICONDIR
hGlobal = LoadResource( hLib, hRsrc );
lpGrpIconDir = LockResource( hGlobal );
// Using an ID from the group, Find, Load and Lock the RT_ICON
hRsrc = FindResource( hLib, MAKEINTRESOURCE( lpGrpIconDir->idEntries[0].nID ),
                      RT_ICON );
hGlobal = LoadResource( hLib, hRsrc );
lpIconImage = LockResource( hGlobal );
// Here, lpIconImage points to an ICONIMAGE structure

struct ICONDIRENTRY {
    BYTE    bWidth;
    BYTE    bHeight;
    BYTE    bColorCount;
    BYTE    bReserved;
    WORD    wReserved1;
    WORD    wReserved2;
    DWORD    dwBytesInRes;
    DWORD    dwImageOffset;
};

struct ICONHEADER {
    WORD ihReserved;
    WORD ihType;
    WORD ihCount;
        
    ICONDIRENTRY *ihEntries;
};

struct ICONIMAGE {
    BITMAPINFOHEADER icHeader;
    RGBQUAD *icColors;
    BYTE *icXOR;
    BYTE *icAND;
};

struct ICON {
    ICONHEADER ich;
    ICONIMAGE *icm;
};