How to open .docx, .xlsx and .pptx files (Microsoft Office 2007)
Having trouble opening .docx and .pptx files that your friend send to you. Since Office 2007, Microsoft has been using Open XML file format for it word, excel and presentations files. Therefore now for word document it will have .docx extension, for excel the extension is .xlsx and for power point presentations the extension is .pptx.
To open and view office 2007 office word document, you need to download Word Viewer. You can view, print and copy the document.
Word Viewer Download Link
Whereas to open .pptx file, you need to download PowerPoint Viewer 2007. You will be able view .pptx files and previous version PowerPoints.
PowerPoint Viewer 2007 Download Link
If you have Microsoft Office 2003, you could edit the word document, excel workbook and powerpoint presentations by downloading Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint File Formats.
Microsoft Office Compatibility Pack Download Link
You can open, edit, and save documents, workbooks, and presentations in the Open XML file formats, which were introduced to Microsoft Office Word, Excel, and PowerPoint Office 2007.