Based on Berkeley Breathed's 1991 children's book A Wish for Wings That Work: An Opus Christmas Story, this TV special aired on December 18 of that year. In a 2003 Washington Post interview, Breathed responded thusly to a question about where one could find a VHS or DVD copy of the cartoon:
Hopefully in the rubbish pail. We can do better than that and we will with an eventual Opus film... but I'm glad you enjoyed it. I presume your family was on speed when they watched it. I would imagine it helps.