Index: base/applications/games/winmine/main.c
===================================================================
--- base/applications/games/winmine/main.c	(revision 51656)
+++ base/applications/games/winmine/main.c	(working copy)
@@ -885,7 +885,7 @@
 
     case WM_LBUTTONDOWN:
         WINE_TRACE("WM_LBUTTONDOWN\n");
-        if( wParam & MK_RBUTTON )
+        if( wParam & (MK_RBUTTON | MK_SHIFT) )
             msg = WM_MBUTTONDOWN;
         TestBoard( hWnd, &board, (short)LOWORD(lParam), (short)HIWORD(lParam), msg );
         SetCapture( hWnd );
@@ -893,7 +893,7 @@
 
     case WM_LBUTTONUP:
         WINE_TRACE("WM_LBUTTONUP\n");
-        if( wParam & MK_RBUTTON )
+        if( wParam & (MK_RBUTTON | MK_SHIFT) )
             msg = WM_MBUTTONUP;
         TestBoard( hWnd, &board, (short)LOWORD(lParam), (short)HIWORD(lParam), msg );
         ReleaseCapture();