diff --git a/dlls/mpr/mpr.rc b/dlls/mpr/mpr.rc
index 10bae36403f..db45d798ad2 100644
--- a/dlls/mpr/mpr.rc
+++ b/dlls/mpr/mpr.rc
@@ -19,6 +19,7 @@
  */
 #include "windef.h"
 #include "winbase.h"
+#include "winuser.h"
 #include "mprres.h"
 
 #include "version.rc"
diff --git a/dlls/mpr/mpr_En.rc b/dlls/mpr/mpr_En.rc
index 225c516b5cf..65fb49f9c2a 100644
--- a/dlls/mpr/mpr_En.rc
+++ b/dlls/mpr/mpr_En.rc
@@ -24,3 +24,23 @@ STRINGTABLE DISCARDABLE
 {
     IDS_ENTIRENETWORK "Entire Network"
 }
+
+IDD_PROXYDLG DIALOG LOADONCALL MOVEABLE DISCARDABLE 36, 24, 250, 154
+STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
+CAPTION "Enter Network Password"
+FONT 8, "Helv"
+{
+ LTEXT "Please enter your username and password:", IDC_EXPLAIN, 40, 6, 150, 15
+ LTEXT "Proxy", -1, 40, 26, 50, 10
+/* LTEXT "Realm", -1, 40, 46, 50, 10 */
+ LTEXT "User", -1, 40, 66, 50, 10
+ LTEXT "Password", -1, 40, 86, 50, 10
+ LTEXT "" IDC_PROXY, 80, 26, 150, 14, 0
+ LTEXT "" IDC_REALM, 80, 46, 150, 14, 0
+ EDITTEXT IDC_USERNAME, 80, 66, 150, 14, ES_AUTOHSCROLL | WS_BORDER | WS_TABSTOP
+ EDITTEXT IDC_PASSWORD, 80, 86, 150, 14, ES_AUTOHSCROLL | WS_BORDER | WS_TABSTOP | ES_PASSWORD
+ CHECKBOX "&Save this password (Insecure)", IDC_SAVEPASSWORD,
+           80, 106, 150, 12, BS_AUTOCHECKBOX | WS_GROUP | WS_TABSTOP
+ PUSHBUTTON "OK", IDOK, 98, 126, 56, 14, WS_GROUP | WS_TABSTOP | BS_DEFPUSHBUTTON
+ PUSHBUTTON "Cancel", IDCANCEL, 158, 126, 56, 14, WS_GROUP | WS_TABSTOP
+}
diff --git a/dlls/mpr/mprres.h b/dlls/mpr/mprres.h
index c144e557b60..fa9cf8be7d6 100644
--- a/dlls/mpr/mprres.h
+++ b/dlls/mpr/mprres.h
@@ -20,4 +20,13 @@
 
 #define IDS_ENTIRENETWORK 1
 
+#define IDD_PROXYDLG     0x400
+
+#define IDC_PROXY        0x401
+#define IDC_REALM        0x402
+#define IDC_USERNAME     0x403
+#define IDC_PASSWORD     0x404
+#define IDC_SAVEPASSWORD 0x405
+#define IDC_EXPLAIN      0x406
+
 #endif /* ndef __WINE_MPRRES_H__ */
diff --git a/dlls/mpr/nps.c b/dlls/mpr/nps.c
index aa9519b822c..a4e478d94f1 100644
--- a/dlls/mpr/nps.c
+++ b/dlls/mpr/nps.c
@@ -2,6 +2,7 @@
  * MPR Network Provider Services functions
  *
  * Copyright 1999 Ulrich Weigand
+ * Copyright 2004 Mike McCormack for CodeWeavers Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -18,24 +19,109 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#include "config.h"
+
 #include <stdarg.h>
 
 #include "windef.h"
 #include "winbase.h"
+#include "winuser.h"
 #include "winnetwk.h"
 #include "netspi.h"
 #include "wine/debug.h"
+#include "winerror.h"
 
 WINE_DEFAULT_DEBUG_CHANNEL(mpr);
 
+#include "wine/unicode.h"
+
+#include "mprres.h"
+
+/***********************************************************************
+ *         NPS_ProxyPasswordDialog
+ */
+static INT_PTR WINAPI NPS_ProxyPasswordDialog(
+    HWND hdlg, UINT uMsg, WPARAM wParam, LPARAM lParam )
+{
+    HWND hitem;
+    LPAUTHDLGSTRUCTA lpAuthDlgStruct;
+
+    if( uMsg == WM_INITDIALOG )
+    {
+        TRACE("WM_INITDIALOG (%08lx)\n", lParam);
+
+        /* save the parameter list */
+        lpAuthDlgStruct = (LPAUTHDLGSTRUCTA) lParam;
+        SetWindowLongPtrW( hdlg, GWLP_USERDATA, lParam );
+
+        if( lpAuthDlgStruct->lpExplainText )
+        {
+            hitem = GetDlgItem( hdlg, IDC_EXPLAIN );
+            SetWindowTextA( hitem, lpAuthDlgStruct->lpExplainText );
+        }
+
+        /* extract the Realm from the proxy response and show it */
+        if( lpAuthDlgStruct->lpResource )
+        {
+            hitem = GetDlgItem( hdlg, IDC_REALM );
+            SetWindowTextA( hitem, lpAuthDlgStruct->lpResource );
+        }
+
+        return TRUE;
+    }
+
+    lpAuthDlgStruct = (LPAUTHDLGSTRUCTA) GetWindowLongPtrW( hdlg, GWLP_USERDATA );
+
+    switch( uMsg )
+    {
+    case WM_COMMAND:
+        if( wParam == IDOK )
+        {
+            WCHAR username[0x20], password[0x20];
+
+            username[0] = 0;
+            hitem = GetDlgItem( hdlg, IDC_USERNAME );
+            if( hitem )
+                GetWindowTextA( hitem, lpAuthDlgStruct->lpUsername, lpAuthDlgStruct->cbUsername );
+            
+            password[0] = 0;
+            hitem = GetDlgItem( hdlg, IDC_PASSWORD );
+            if( hitem )
+                GetWindowTextA( hitem, lpAuthDlgStruct->lpPassword, lpAuthDlgStruct->cbPassword );
+
+            EndDialog( hdlg, WN_SUCCESS );
+            return TRUE;
+        }
+        if( wParam == IDCANCEL )
+        {
+            EndDialog( hdlg, WN_CANCEL );
+            return TRUE;
+        }
+        break;
+    }
+    return FALSE;
+}
 
 /*****************************************************************
  *  NPSAuthenticationDialogA [MPR.@]
  */
 DWORD WINAPI NPSAuthenticationDialogA( LPAUTHDLGSTRUCTA lpAuthDlgStruct )
 {
-    FIXME( "(%p): stub\n", lpAuthDlgStruct );
-    return WN_NOT_SUPPORTED;
+    HMODULE hwininet = GetModuleHandleA( "mpr.dll" );
+
+    TRACE("%p\n", lpAuthDlgStruct);
+
+    if( !lpAuthDlgStruct )
+        return WN_BAD_POINTER;
+    if( lpAuthDlgStruct->cbStructure < sizeof *lpAuthDlgStruct )
+        return WN_BAD_POINTER;
+
+    TRACE("%s %s %s\n",lpAuthDlgStruct->lpResource,
+          lpAuthDlgStruct->lpOUTitle, lpAuthDlgStruct->lpExplainText);
+
+    return DialogBoxParamW( hwininet, MAKEINTRESOURCEW( IDD_PROXYDLG ),
+             lpAuthDlgStruct->hwndOwner, NPS_ProxyPasswordDialog, 
+             (LPARAM) lpAuthDlgStruct );
 }
 
 /*****************************************************************