The other company will not be able to read the archive file because it will still be a version 25 file.
Unless of course they upgrade to 25 as well.
You can 'save as' a version 24 file.
You could then open it in 24 and save it as an archive file and it will now be in 24 format.
The only problem with this is if the 3rd party library objects you have are not compatible with 24 you will lose them.
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