The screplay file extension is primarily associated with ScreenFlow, a popular screencasting and video editing software developed by Telestream for macOS. This proprietary file format is not a flattened video file like MP4 or MOV, but rather a specialized project and recording container. It stores raw, high-definition screen recordings, audio tracks captured from microphones or system output, webcam footage, and all user-defined editing actions, transitions, text overlays, and annotations. Because it retains the unrendered source elements and non-destructive editing timeline, users can continuously modify the project, adjust audio levels separately, change cursor behaviors, and alter dimensions without losing video quality. When the editing process is complete, the screplay project must be exported into a standard video format for sharing or uploading. Due to its platform-specific nature and heavy reliance on the ScreenFlow application environment, opening or editing these files outside of the macOS ecosystem is extremely difficult without first exporting them into universally compatible video containers.