The official repository is at libntl.org , where you can find the latest Unix ( .tar.gz ) and Windows ( .zip ) distributions.
Standard Windows or Mac tools often cannot open .rar files natively. To extract the "NTL" files inside, you should use: Obtaining and Installing NTL for Windows - A Tour of NTL Download NTL rar
This blog post explains what "NTL rar" likely refers to—usually the or scripts for the Diablo 2 D2NT mod —and provides guidance on how to download and manage these files. Understanding and Downloading "NTL rar" Files The official repository is at libntl
For other NTL-related projects, reputable hosting sites like SourceForge are common. How to Open a .rar File Understanding and Downloading "NTL rar" Files For other
The .ntl file suffix is often related to scripts for the D2NT mod in Diablo 2. Where to Download
Always use official sources to ensure your downloads are secure: