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A C# script in Unity is commonly edited in an Integrated Development Environment (IDE). This is because IDEs are designed to provide a robust set of tools for coding, including code highlighting, auto-completion, debugging features, and advanced navigation tools that enhance productivity and reduce errors during development.

When Unity is used, it typically integrates with popular IDEs such as Visual Studio or JetBrains Rider, which offer a more efficient environment for programming compared to basic text editors. These environments allow developers to leverage the full capabilities of programming, such as managing solution files, debugging code, and accessing extensive libraries and tools that streamline the development process.

While it is possible to edit scripts in a text editor, this option lacks the features that IDEs offer, making it less common for C# script editing in Unity projects. The Inspector and Project window serve different purposes; the Inspector is used for viewing and adjusting properties of GameObjects or components, while the Project window is for file management and organization. Neither of these is designed for code editing, further solidifying the position of the IDE as the primary environment for script modification in Unity development.