Solved! Installing alien biomes mod allowed me to open the save, and I've now moved everything over to a new save via blueprint. Thanks guys.

I have a save that I started in the 1.1.110-0 version of factorio, using the Space Exploration mod, among others, that I used to do combinator development. When Space Age came out, I converted it to the new version, and let factorio delete all of the modded items, I only needed to keep the ...