@fdkill (View Post)
Those are just the source code of the Lua script pasted into the webpage or a special website designed to host pastes, rather than distributing a file. This is often the preferred format, as it allows forum-goers to see the source code and judge the code without downloading extraneous files to do that.

You can use them by copying everything in the source code into Notepad or your favorite plain-text editor (Word and WordPad are what we'd call rich text editors, those won't be good as they store formatting as well as the source code), and then saving the file with the extension ".lua". After that, just move the new ".lua" source file into where you first extracted The Powder Toy. After that, you can just open The Powder Toy, crack open the console and then type

dofile("my_script.lua")

into the prompt.