What a beautiful spooky little film, I'm biased because I love Welles. It's available in the UK on both the Macbeth and Othello DVDs with an intro by Peter Bogdanovich.
Great harp music on the soundtrack.

If you like RTG ,and havent seen it, check out Three Cases of Murder, a British portmanteau film of the 50's.
Welles appears in the third segment "Lord Mountdrago "based on a story by Somerset Maugham. It's pretty good and although the second segment is pretty hum drum the first story "The Man in the Picture" is a creepy little tale that I think you'll appreciate.