Convert PPTX Online. PPTX Office Open XML Presentation. Format introduction The Office Open XML file formats are a set of file formats that can be used to represent electronic office documents. There are formats for word processing documents, spreadsheets and presentations as well as specific formats for material such as mathematical formulae, graphics, bibliographies etc. Technical details The Office Open XML file formats are a set of file formats that can be used to represent electronic office documents. There are formats for word processing documents, spreadsheets and presentations as well as specific formats for material such as mathematical formulae, graphics, bibliographies etc. Free Examples Of Powerpoint Presentations' title='Free Examples Of Powerpoint Presentations' />Sample Powerpoint DocumentDownload Sample Files from PowerPoint Graphics and. Download Sample file to. The file you will download is a zipped file. Save and extract the pptx files to. Opening PPTX files. Did your computer fail to open a PPTX file We explain what PPTX files are and recommend software that we know can open or convert your PPTX files. Sample. xlsx download at 2shared. Marcy Elliptical Trainer Manual.