There is only one file type that uses the .KTH extension:
Presentation theme file used by Keynote, an Apple iWork program used to create presentations; contains the default graphics, fonts, and layout settings for a presentation; used for saving presentation templates.
To open a Keynote theme, selectfrom the application menu, or select a theme from the Theme Chooser when the application starts. You can save custom themes by selecting .
Custom KTH theme files are saved to the following directory by default:
Updated: August 21, 2015