The PPSX file format is a specialized presentation file format developed by Microsoft for use with PowerPoint. Unlike the standard PPTX format, which is designed for editing, a PPSX file is configured to open directly into 'Slide Show' mode. When a user double-clicks a PPSX file, the presentation immediately begins playing in full-screen mode, bypassing the editing interface of the PowerPoint application. This makes it an ideal format for distributing finished presentations to audiences, as it prevents accidental modifications to the slides and provides a more professional, immersive experience. Technically, PPSX is based on the Open XML standard, which uses a ZIP-compressed collection of XML files, images, and other media assets. Because it follows the Open XML structure, it is highly compatible with modern office suites and can be easily opened by various presentation software beyond just Microsoft PowerPoint. It effectively serves as a read-only distribution version of a standard PowerPoint presentation.