Hmm. April 2005. There's a good chance that someone from the forums at that time who is no longer active might have the missing file.
That sort of loss can be infuriating. I once had a load of photos that I took as a young teenager: photos of friends and family, traction engines (yes, I was a nerd even then
), assorted animals, etc. Carefully transported them from house to house until on one house move I couldn't find them to pack up - then realised that I had no recollection of seeing them since the PREVIOUS house move. Since then I've found several occasions to want to look at the damn things.
Life can be a pain at times.
Hope you find the video - just the sort of thing to show your children and grandchildren. Hey! Is that what this is about ... ?
But I think Cash's and David R's suggestion is the best bet - but don't leave it too long or it'll go the same way as some early Dr Who episodes and that terrific Andromeda sci-fi series from the 60s/70s.