tif file: This is a "tiff" image file and can be opened in most image editors or viewers.
docx file: You need the Microsoft Word program, a free Microsoft Word viewer, or a program that can import Word files in order to view this file. To learn more about the free Microsoft Word Viewer, visit the Microsoft Office Viewer for Word 2007 File Format.
PPTX file: You need Microsoft PowerPoint to view this file. Download a free PowerPoint viewer for PC or Macintosh.