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What do you mean with "now on steam"?
https://steamdb.info/app/2630/history/
Older CoD, no...
And newer Windows OS, good luck getting old retail games to even run the Installer/Setup without being blocked, let alone run them.
It will probably be reason enough for many to keep an older machine going, using WinXP or maybe Win7, so they can reinstall/run old games like that they do not wish to re-purchase.
Say it installs & runs; all adding to Steam will do for you is add a CoD2.exe shortcut into your local Steam Client Library listing; nothing more. It's a mere desktop shortcut within steam library, that's it.