Added typedef of DROPFILES.

diff --git a/include/shlobj.h b/include/shlobj.h
index ee8b616..ff0b096 100644
--- a/include/shlobj.h
+++ b/include/shlobj.h
@@ -479,7 +479,16 @@
 
 #define CSIDL_FLAG_MASK		0xff00
 
-
+/*
+ * DROPFILES for CF_HDROP and CF_PRINTERS
+ */
+typedef struct _DROPFILES
+{
+  DWORD pFiles;
+  POINT pt;
+  BOOL  fNC;
+  BOOL  fWide;
+} DROPFILES;
 
 #ifdef __cplusplus
 } /* extern "C" */