A File which contains readymade styles that can be used for a presentation is called :

A file that contains readymade styles and designs for a presentation is known as a Template. Templates provide a structured layout and style, making it easier to create a presentation with consistent formatting and design.

Key Points:
Template: Includes predefined styles, layouts, and design elements that can be applied to new presentations.

AutoStyle: Not a standard term used in PowerPoint for such files.

Wizard: A tool that guides users through a series of steps to complete a task but does not specifically refer to a file with styles.

Pre formatting: Refers to the formatting applied in advance, but it is not the term used for files with readymade styles.