mtsedit/etc/Minetest_Tiled.tsx

<?xml version="1.0" encoding="UTF-8"?>
<tileset firstgid="0" name="Minetest" tilewidth="16" tileheight="16" tilecount="256" columns="16">
  <image source="Minetest_Tiled.png" width="256" height="256"/>
</tileset>