telnet exe with dot has also given me the forbidden warning.
Seems to be some sort of anti virus/spam measure. It's driven me mad for some hours. Going to try saying run Word.exe. As you can see it appears to be Windows command level executables, not standard software. How about DIR.exe
Perhaps Black Hole could add something to https://hummy.tv/forum/threads/newbies-guide-to-the-hummy-tv-forum.6114/Might be worth mentioning to others in the forum notes.