These types of files, OTP - OpenDocument Presentation Template files are used in the program Open Office. OTP files are used as templates to create presentations in the Open Office program. The Open Office program is a free, open source alternative to traditional word processing programs currently on the market. Because the program is open source many users have created multiple unique changes and adaptations.
The OPT- OpenDocument Presentation Template files are used for creating presentations. These types of presentions might be used as part of a board meeting or as an outline for a classroom lecture.