(svn r8914) -Regression (UTF8): Win9x is very picky about trailing slashes in paths, so C:\\* will not work (but C:\Windows\\* does; go figure). Thanks glx for pointing it out and for the initial fix.

src/newgrf_gui.cpp

@@ -485,6 +485,9 @@ static void NewGRFWndProc(Window *w, WindowEvent *e)
 			break;
 
 		case WE_DESTROY:
+			if (!WP(w, newgrf_d).execute) {
+				CopyGRFConfigList(WP(w, newgrf_d).orig_list, *WP(w, newgrf_d).list);
+			}
 			/* Remove the temporary copy of grf-list used in window */
 			ClearGRFConfigList(WP(w, newgrf_d).list);
 			break;