In this tutorial, I will show you how to fix the RCT3 billboard problem for Windows Vista and 7. If you haven't done this, when you use billboards in the game, it will crash and your unsaved work will be lost. If you have any questions, leave a reply in this thread.
1. First, click start and search for the program called "Command Prompt".
2. Type in the following words exactly how they are typed below:
cd "C:\Users\(Your Username)\documents"
Now press enter.
This is what it looks like if your username is Alex, like mine:
3. Now type in these exactly how I did:
rmdir "MY PICTURES"
Press enter.
This is what you should have:
Now just type EXIT and press enter or close the program.
4. Go to your documents folder. Press the "New Folder" button.
5. Now name it:
MY PICTURES
Hit enter and you will have your new folder.
6. Now drag any pictures into the folder that you want in your game:
7. Open RCT3 and you now can use your own pictures in the game! Here's an example of a billboard in use: