--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/internal/mozilla/nsISupports.d	Fri Jan 02 17:45:10 2009 -0800
@@ -0,0 +1,30 @@
+module dwt.internal.mozilla.nsISupports;
+
+import dwt.internal.mozilla.Common;
+import dwt.internal.mozilla.nsID;
+
+const char[] NS_ISUPPORTS_IID_STR = "00000000-0000-0000-c000-000000000046";
+
+const nsIID NS_ISUPPORTS_IID= 
+        { 0x00000000, 0x0000, 0x0000, 
+          [ 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46 ] };
+
+interface IUnknown
+{
+    static const char[] IID_STR = NS_ISUPPORTS_IID_STR;
+    static const nsIID IID = NS_ISUPPORTS_IID;
+
+extern(System):
+    nsresult QueryInterface( nsIID* uuid, void **result);
+
+    nsrefcnt AddRef();
+    nsrefcnt Release();
+}
+
+// WHY WE USE COM's IUnknown for XPCOM:
+//
+// The IUnknown interface is special-cased in D and is specifically designed to be
+// compatible with MS COM.  XPCOM's nsISupports interface is the exact equivalent
+// of IUnknown so we alias it here to take advantage of D's COM support. -JJR
+
+alias IUnknown nsISupports;
\ No newline at end of file