CONSTANT: DRAGDROP_S_CANCEL 0x00040101
CONSTANT: DRAGDROP_S_USEDEFAULTCURSORS 0x00040102
+CONSTANT: E_NOTIMPL 0x80004001
CONSTANT: E_NOINTERFACE 0x80004002
CONSTANT: E_FAIL 0x80004005
+CONSTANT: E_UNEXPECTED 0x8000FFFF
+CONSTANT: E_OUTOFMEMORY 0x8007000E
CONSTANT: E_INVALIDARG 0x80070057
CONSTANT: MK_ALT 0x20