Oh my god I can see again! It works! It seems to be missing a few textures but by and large it's intact.
I'm so grateful for your help. You're all awesome.

Cheers!
-xaq

Thanks so much for doing that. Did the corrected pk3 work for you? It's still giving me the same error.

Ah, I didn't notice that my attachment had been rejected for being too large. I should've verified. Here's a link.
http://www.columbia.edu/~zsp2101/art/furlong.pk3
Thanks so much for looking!

Dear community, About seven years ago I went to the trouble of making a Quake3 map of my childhood home (we were moving out then). This map used to work, and it was awesome! But now I can no longer get the file to open, and I have no idea why, despite many efforts to figure it out. So I'm wondering ...