--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/internal/mozilla/nsIPrefService.d	Wed Aug 06 18:29:44 2008 -0700
@@ -0,0 +1,30 @@
+module dwt.internal.mozilla.nsIPrefService;
+
+import dwt.internal.mozilla.Common;
+import dwt.internal.mozilla.nsID;
+import dwt.internal.mozilla.nsISupports;
+import dwt.internal.mozilla.nsIPrefBranch;
+import dwt.internal.mozilla.nsIFile;
+
+const char[] NS_IPREFSERVICE_IID_STR = "decb9cc7-c08f-4ea5-be91-a8fc637ce2d2";
+
+const nsIID NS_IPREFSERVICE_IID= 
+  {0xdecb9cc7, 0xc08f, 0x4ea5, 
+    [ 0xbe, 0x91, 0xa8, 0xfc, 0x63, 0x7c, 0xe2, 0xd2 ]};
+
+extern(System)
+
+interface nsIPrefService : nsISupports {
+
+  static const char[] IID_STR = NS_IPREFSERVICE_IID_STR;
+  static const nsIID IID = NS_IPREFSERVICE_IID;
+
+  nsresult ReadUserPrefs(nsIFile aFile);
+  nsresult ResetPrefs();
+  nsresult ResetUserPrefs();
+  nsresult SavePrefFile(nsIFile aFile);
+  nsresult GetBranch(char *aPrefRoot, nsIPrefBranch *_retval);
+  nsresult GetDefaultBranch(char *aPrefRoot, nsIPrefBranch *_retval);
+
+}
+