What is .KTH file 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, select File ? Choose Theme... from the application menu, or select a theme from the Theme Chooser when the application starts. You can save custom themes by selecting File ? Save Theme....
Custom KTH theme files are saved to the following directory by default:
You can see a list of software programs here on www.easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.