I looked it up. Even though it was marketed as Stephen King's This is Horror, only the last part is about him. It is him talking about Woman in the Room and Frank Darabont. At the time though it was a good tape, because it was before dvd, so you basically never saw Making of's and few interviews with horror directors, stars etc. There is a lot of attention for Freddy Krueger, because he was the most popular horror icon of the '80s. But there's also Clive Barker, Texas Chainsaw, Hitchcock and Psycho etc. etc. It is about 4 hours. It reminds sort of World of Hammer (for some reason these things are all called 'World of...'): clips and a voice over commenting in between.
But Shining in the Dark is purely King. It's from 1999, so the same year as Green Mile which obviously gets attention. It's about 50 minutes, but I don't think it's on dvd.