I think you are better of buying a copy for yourself, then you have the original documention and you can always reinstall the game should the need arise. Besides that, the games are fairly cheap these days.
I got a cd with WC1 and WC2 that inluded all the Secret Missions, and Special Operations, plus the WC2 speech pack. It came with most of the original documentation, including all the vital imformation on how to install and play the game plus the codes for WC1-SM2. I paid about 12 dollars I think, unfortunately the cd is on loan, indefinately.
You can download the add-ons for Kilrathi Saga at no charge.