.KTH File

The kth file extension is associated with the Apple iWork Keynote presentation program and used for files that contain Keynote theme, that is used to quickly create presentations with same layout and settings.

Files with kth extension are used for the Keynote for Mac OS. 

How to open:

Use Keynote for Mac to open files with kth extension.

How to convert:

As far as we know, this .kth file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.