BSCF enum defines flags, not an enumeration.

include/urlmon.h

@@ -38,11 +38,11 @@ typedef struct _tagBINDINFO {
 } BINDINFO;
 
 typedef enum {
-    BSCF_FIRSTDATANOTIFICATION,
-    BSCF_INTERMEDIATEDATANOTIFICATION,
-    BSCF_LASTDATANOTIFICATION,
-    BSCF_DATAFULLYAVAILABLE,
-    BSCF_AVAILABLEDATASIZEUNKNOWN
+    BSCF_FIRSTDATANOTIFICATION = 0x01,
+    BSCF_INTERMEDIATEDATANOTIFICATION = 0x02,
+    BSCF_LASTDATANOTIFICATION = 0x04,
+    BSCF_DATAFULLYAVAILABLE = 0x08,
+    BSCF_AVAILABLEDATASIZEUNKNOWN = 0x10
 } BSCF;
 
 #define MK_S_ASYNCHRONOUS 0x000401E8