What is a .NXTHEME file?
An NXTHEME file is a special type of file used to change how the Nintendo Switch gaming console's screens look. This includes the main screen you see when you turn on the console, the screen that locks the console, and other screens you might see while using it. Inside an NXTHEME file, there are two important parts: a .JPG image, which is a picture that can be used as the background, and JSON data, which is a type of code that tells the Nintendo Switch how to use the picture and change the screen's appearance.
To create your own custom theme for the Nintendo Switch, you would use a program called Switch Theme Injector. This program lets you put together the picture and the code needed to make your theme. After you've created your NXTHEME file with Switch Theme Injector, you then need to install it onto your Nintendo Switch. To do this, you use a program called NXThemes, which takes the NXTHEME file and applies it to your console, so you can see your new theme on the screens.
In summary, if you want to customize how your Nintendo Switch looks with different themes, you would use the Switch Theme Injector program to create NXTHEME files on a computer. Then, you use the NXThemes program to install these files onto your Nintendo Switch.
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