I recently tried to play Secret Files 2 on Windows 10. It all seemed fine with installation but when I hit play it showed error message asking for the original disc which was in the slot. I opened and shut and still same message.
I uninstalled and tried new install but the same thing keeps happening after a few tries.
Anyone else have the problem or know why this is happening? Thanks.

You might try installing in compatibility mode, but at the Steam Community, I found several posts from people saying their disk games of Tungaska wouldn't work on Windows 10.

https://steamcommunity.com/app/40330/discussions/0/522728000874521037/

The disc version of the game game uses TAGES.
You can try updating TAGES (old versions don't allow the game to start on modern Windows) or using a NoCD.