What is .STU file extension?
Project file created by Pinnacle Studio, a program used to create and edit videos; stores all project information, including video, audio, effects, and timelines; used to save and load video projects.
Pinnacle Studio can export STU files into a video file types such as .AVI and .M4V. It can also burn projects to DVD and Blu-ray disc.
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.