ProPresenter 4 Bundle File
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What is a PRO4X file?
Presentation package created by ProPresenter, a church worship slide preparation application; may include multiple slides as well as documents, audio files, and video files; used for packaging all media files into a single bundle; useful for archival purposes and for transferring playlists between church computers.
PRO4X files are saved in a compressed .ZIP format. Therefore, you can open them with any Zip decompression utility.