diff --git a/cfg/windows.cfg b/cfg/windows.cfg
index 72f97006d..055e3047f 100644
--- a/cfg/windows.cfg
+++ b/cfg/windows.cfg
@@ -1000,6 +1000,13 @@
     <alloc init="true" arg="1">_wfopen_s</alloc>
     <alloc init="true" arg="1">_tfopen_s</alloc>
     <dealloc>fclose</dealloc>
+    <dealloc>_fcloseall</dealloc>
+  </resource>
+  <resource>
+    <alloc init="true">_open</alloc>
+    <alloc init="true">_topen</alloc>
+    <alloc init="true">_wopen</alloc>
+    <dealloc>_close</dealloc>
   </resource>
   <resource>
     <alloc init="true">_popen</alloc>
@@ -3052,4 +3059,31 @@ HFONT CreateFont(
       <valid>0:</valid>
     </arg>
   </function>
+  <!-- int _fcloseall( void ); -->
+  <function name="_fcloseall">
+    <noreturn>false</noreturn>
+  </function>
+  <!-- int _open(const char *filename,  int oflag [, int pmode] );
+       int _wopen(  const wchar_t *filename,  int oflag [, int pmode]); -->
+  <function name="_open,_wopen,_topen">
+    <use-retval/>
+    <noreturn>false</noreturn>
+    <arg nr="1">
+      <not-null/>
+      <not-uninit/>
+    </arg>
+    <arg nr="2">
+      <not-uninit/>
+    </arg>
+    <arg nr="3">
+      <not-uninit/>
+    </arg>
+  </function>
+  <!-- int _close(int fildes); -->
+  <function name="_close">
+    <noreturn>false</noreturn>
+    <arg nr="1">
+      <not-uninit/>
+    </arg>
+  </function>
 </def>