diff --git a/cfg/wxwidgets.cfg b/cfg/wxwidgets.cfg
index 306ccda06..dcdd7530b 100644
--- a/cfg/wxwidgets.cfg
+++ b/cfg/wxwidgets.cfg
@@ -662,6 +662,8 @@
   <define name="wxIMAGE_QUALITY_BOX_AVERAGE" value="3"/>
   <define name="wxIMAGE_QUALITY_NORMAL" value="4"/>
   <define name="wxIMAGE_QUALITY_HIGH" value="5"/>
+  <define name="wxFS_READ" value="1"/>
+  <define name="wxFS_SEEKABLE" value="4"/>
   <define name="wxTextFileType_None" value="0"/>
   <define name="wxTextFileType_Unix" value="1"/>
   <define name="wxTextFileType_Dos" value="2"/>
@@ -11759,6 +11761,27 @@
       <valid>0.0:1.0</valid>
     </arg>
   </function>
+  <!-- void wxFileSystem::AddHandler( wxFileSystemHandler * handler ) -->
+  <function name="wxFileSystem::AddHandler">
+    <noreturn>false</noreturn>
+    <returnValue type="void"/>
+    <leak-ignore/>
+    <arg nr="1" direction="in">
+      <not-uninit/>
+      <not-null/>
+    </arg>
+  </function>
+  <!-- wxFSFile * wxFileSystem::OpenFile( const wxString & location, int flags = wxFS_READ ) -->
+  <function name="wxFileSystem::OpenFile">
+    <noreturn>false</noreturn>
+    <returnValue type="wxFSFile *"/>
+    <use-retval/>
+    <leak-ignore/>
+    <arg nr="1" direction="in"/>
+    <arg nr="2" default="wxFS_READ" direction="in">
+      <not-uninit/>
+    </arg>
+  </function>
   <!-- void wxSplitterWindow::SetSashPosition( int position, bool redraw = true ) -->
   <function name="wxSplitterWindow::SetSashPosition">
     <noreturn>false</noreturn>