.NTL File

The ntl file extension is associated with the Diablo 2, a role-playing computer game for Microsoft Windows and Mac OS X (macOS) operating system.

The ntl file stores script for mod called D2NT.

How to open:

You can most likely view or edit these scripts using text editor.

How to convert:

These files are not meant to be converted to anything else, at best you can edit them.