https://www.dropbox.com/s/oeorn9vlk54nnlp/ExtremeXOS_npp.xml
1. To load it, open Notepad++ and go to “Language, Define your language…”
2. In the “Define” window, click “Import.”
3. Navigate to the folder with the xml file and import it.
4. Restart Notepad++
5. Now you should see “ExtremeXOS” in the language menu.
Above URL would download the requested file.