RCT1 No-CD is as easy as editing a Registry key actually.
— Install the base game and both expansions normally.
— Copy and merge the `ObjData` and `Data` folders from the CDs directly into the install folder.
— Open RegEdit, navigate to `HKEY_LOCAL_MACHINE\SOFTWARE\Fish Technology Group\Rollercoaster Tycoon Setup`, and change `Path` and `SetupPath` to the path to your install folder.
Source: Did this just a couple months ago on my HITACHI FLORA 270HX.
When playing The Sims as a kid, there were loads of expansions, but you only needed the last one in the chain you had installed to play. So if I had 1 and 2, and a friend 3 and 4, I could buy 5 and then borrow my friends disks and install those.
Or if it was a game for a LAN, just boot the game with the CD in, then pass the CD along for others to do the same.
— Install the base game and both expansions normally.
— Copy and merge the `ObjData` and `Data` folders from the CDs directly into the install folder.
— Open RegEdit, navigate to `HKEY_LOCAL_MACHINE\SOFTWARE\Fish Technology Group\Rollercoaster Tycoon Setup`, and change `Path` and `SetupPath` to the path to your install folder.
Source: Did this just a couple months ago on my HITACHI FLORA 270HX.