Index: src/os_win.c
==================================================================
--- src/os_win.c
+++ src/os_win.c
@@ -3587,10 +3587,17 @@
        || eType==SQLITE_OPEN_TRANSIENT_DB || eType==SQLITE_OPEN_WAL
   );
 
   assert( id!=0 );
   UNUSED_PARAMETER(pVfs);
+
+#if SQLITE_OS_WINRT
+  if( !sqlite3_temp_directory ){
+    sqlite3_log(SQLITE_ERROR,
+        "sqlite3_temp_directory variable should be set for WinRT");
+  }
+#endif
 
   pFile->h = INVALID_HANDLE_VALUE;
 
   /* If the second argument to this function is NULL, generate a 
   ** temporary file name to use