<PackageReference Include="System.Drawing.Common" Version="10.0.4" />

Windows.Win32.System.SystemServices.MODIFIERKEYS_FLAGS

namespace Windows.Win32.System.SystemServices { internal enum MODIFIERKEYS_FLAGS : uint { MK_LBUTTON = 1, MK_RBUTTON = 2, MK_SHIFT = 4, MK_CONTROL = 8, MK_MBUTTON = 16, MK_XBUTTON1 = 32, MK_XBUTTON2 = 64 } }