Here are the data structures with brief descriptions:

[detail level 12]

▼NEMF
CBRUSH	Graphics Brush
CBYTEARRAY	Represent a byte array in a simple way
CCHARSTR	Represent an ASCII character string in a simple way
CDATASTREAM	Support different endian modes when reading and writing the metafile
CDWORDARRAY	Represent an array of double word integers in a simple way
CEMRARC	EMF Arc
CEMRARCTO	EMF Arc To
CEMRBEGINPATH	EMF Begin Path
CEMRCLOSEFIGURE	EMF Close Figure
CEMRCREATEBRUSHINDIRECT	EMF Brush
CEMRCREATEPALETTE	EMF Palette
CEMRCREATEPEN	EMF Pen
CEMRDELETEOBJECT	EMF Delete Object
CEMRELLIPSE	EMF Ellipse
CEMRENDPATH	EMF End Path
CEMREOF	EMF End of File Record
CEMREXTCREATEFONTINDIRECTW	EMF Font
CEMREXTCREATEPEN	EMF Extended Pen
CEMREXTTEXTOUTA	EMF Extended Text Output ASCII
CEMREXTTEXTOUTW	EMF Extended Text Output Wide character
CEMRFILLPATH	EMF Fill path
CEMRLINETO	EMF Line To
CEMRMODIFYWORLDTRANSFORM	EMF Modify World Transform
CEMRMOVETOEX	EMF MoveTo (ex)
CEMRPOLYBEZIER	EMF Polybezier
CEMRPOLYBEZIER16	EMF Polybezier16
CEMRPOLYBEZIERTO	EMF PolyBezierTo
CEMRPOLYBEZIERTO16	EMF PolyBezierTo16
CEMRPOLYGON	EMF Filled Polygon
CEMRPOLYGON16	EMF Filled Polygon16
CEMRPOLYLINE	EMF Polyline
CEMRPOLYLINE16	EMF Polyline16
CEMRPOLYLINETO	EMF PolylineTo
CEMRPOLYLINETO16	EMF PolylineTo16
CEMRPOLYPOLYGON	EMF Poly Polygon
CEMRPOLYPOLYGON16	EMF Poly Polygon16
CEMRRECTANGLE	EMF Rectangle
CEMRRESTOREDC	EMF Restore DC
CEMRSAVEDC	EMF Save DC
CEMRSCALEVIEWPORTEXTEX	EMF Scale Viewport Extents (ex)
CEMRSCALEWINDOWEXTEX	EMF Scale Window Extents (ex)
CEMRSELECTOBJECT	EMF Select Object
CEMRSETBKCOLOR	EMF Set Background Color
CEMRSETBKMODE	EMF Set Background Mode
CEMRSETMAPMODE	EMF Set Mapping Mode
CEMRSETMETARGN	EMF Set Meta Region
CEMRSETMITERLIMIT	EMF SetMiterLimit
CEMRSETPIXELV	EMF Set Pixel
CEMRSETPOLYFILLMODE	EMF Set the Polygon Fill Mode
CEMRSETTEXTALIGN	EMF Set Text Alignment
CEMRSETTEXTCOLOR	EMF Set Text Color
CEMRSETVIEWPORTEXTEX	EMF Set Viewport Extents (ex)
CEMRSETVIEWPORTORGEX	EMF Set Viewport Origin (ex)
CEMRSETWINDOWEXTEX	EMF Set Window Extent (ex)
CEMRSETWINDOWORGEX	EMF Set Window Origin (ex)
CEMRSETWORLDTRANSFORM	EMF Set World Transform
CEMRSTROKEANDFILLPATH	EMF Stroke and Fill path
CEMRSTROKEPATH	EMF Stroke path
CENHMETAHEADER	Enhanced Metafile Header Record
CEXTPEN	Extended Graphics Pen
CFONT	Graphics Font
CGLOBALOBJECTS
CGRAPHICSOBJECT	A global graphics object
CINTARRAY	Represent an array of integers in a simple way
CMETAFILEDEVICECONTEXT	Graphics Device Context
CMETARECORD	The base class of all metafile records
COBJECT	Global GDI object
CPADDING	All metafile records must be padded out to a multiple of 4 bytes
CPALETTE	Graphics Palette
CPEN	Graphics Pen
CPOINT16ARRAY	Represent an array of 16-bit point in a simple way
CPOINTLARRAY	Represent an array of points in a simple way
CWCHARSTR	Represent a wide (UNICODE) character string in a simple way