AC18 can read (open) files back to AC8.1
But if your file is on floppy disk and you can't read the floppy then there won't be much you can do regardless of what version you have.
Can you open the AC10 file on your old machine?
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10