Can you pass files so players can take there turns on separate computers?

Not in a smooth manner, it is one of the first RTS-games. It is mainly local multiplayer

The best chance of remote multiplayer would be setting up the disk image with retroach-dosbox core and netplay.

You could teorethically use a dosbox version with savestates if you REALLY need to pass files, but I do not think that is what you are after.