The various sources (articles, interviews, forum posts) I’ve found relating to Terry Pratchett’s views on video games.
Terry Pratchett – Going by the Book – PC Gamer 1993 interview – PDF
The E-Mail Interview – Terry Pratchett – PC Zone (January 1995) – PDF
Thief newsgroup (Pratchett’s contributions) – alt.games.thief-dark-project
Terry Pratchett – Online Radio Interview with the Author – The Author Hour
The story behind the Oblivion mod Terry Pratchett worked on | Eurogamer.net
A tribute to Terry Pratchett | PC Gamer
Turning Terry Pratchett’s Discworld into Audiobooks [bit about theme music being inspired by Oblivion] – YouTube