The si97b.exe file you have requested: Mods / Science and Industry / Clients / Science & Industry V0.97b Full Windows - 74.76mb is not available. Perhaps try browsing all files for the game Half-Life and upload any files you want to share or are missing. This is the only information we could locate:
This will install Science and Industry 0.97b on your computer. The file includes everything you need to play SI.