Hoping that I find an answer here ...
I was wondering if there was some way or cheat to unlocking the coasters in Sandbox mode ?  When I open up a type of coaster file to see the different ones, some are not available to use and say "locked"
I appreciate any help on this and thank you in advance

ONE WAY

Play the levels in the game

you can by changing the options.txt in the rct3 folder but i don't know how. heres a link to help you with that though
options.txt "cheats" with NEW Soaked Expansion keywords.

Thank you both for your replies
I wasn't sure if playing the scenarios would unlock the coasters and save them opened for the sandbox mode. Good to know that it does (gives me more incentive to play the scenarios now)

Thanks again

There is way to do it, by copy and pasting the certain levels/coasters to the relevant folders.Tikitiki or Beelitz might be able to help.PM either of them.