Added downloadmgr.idl.

diff --git a/dlls/uuid/uuid.c b/dlls/uuid/uuid.c
index 122d174..946f4ae 100644
--- a/dlls/uuid/uuid.c
+++ b/dlls/uuid/uuid.c
@@ -59,6 +59,7 @@
 #include "mshtmhst.h"
 #include "richole.h"
 #include "xmldom.h"
+#include "downloadmgr.h"
 
 /* FIXME: cguids declares GUIDs but does not define their values */