UTF-8 with BOM crashes some systems according to 6551f5c120 comment, and there are several cases where Minetest is buggy with files that use CRLF line endings (though none I'm aware that affect these files), so strip CRs and BOM
6551f5c120
Currently the example portals just take you to the nether, like nether portals. In theory they could take players anywhere.