How do you change a .txt file into a .obb file?

To change a .txt file into a .obb file, you need to rename the file extension from .txt to .obb. This can typically be done by right-clicking the file, selecting "Rename," and changing the extension. However, simply renaming the file won't convert its content; the .obb format is specifically designed for storing binary files, often used for Android apps. If you need to convert the content to a valid .obb format, you'll require a specific tool or script that packages the data appropriately.