<PackageReference Include="System.Drawing.Common" Version="11.0.0-preview.1.26104.118" />

Windows.Win32.System.Com.CALLCONV

enum CALLCONV
Identifies the calling convention used by a member function described in the METHODDATA structure.
namespace Windows.Win32.System.Com { internal enum CALLCONV { CC_FASTCALL = 0, CC_CDECL = 1, CC_MSCPASCAL = 2, CC_PASCAL = 2, CC_MACPASCAL = 3, CC_STDCALL = 4, CC_FPFASTCALL = 5, CC_SYSCALL = 6, CC_MPWCDECL = 7, CC_MPWPASCAL = 8, CC_MAX = 9 } }