These are often .txt or .m3u files containing server links.
Detailed "how-to" guides are available as text files (e.g., stb_howto.txt ). stb/docs/stb_howto.txt at master · nothings/stb - GitHub Download STB txt
You can download the specific header files directly from the official stb GitHub repository. These are often
Select to open the folder where AutoCAD stores these files, and paste your file there. 2. IPTV / Set-Top Box (STB) Playlists Download STB txt
For software developers, stb is a famous collection of for C/C++.