- Do not unzip the file if it gets downloaded as a .pptx.zip file (unless it is supposed to be a .zip file).
- Rename the file to remove the .zip extension and keep the .pptx extension.
.pptx files are viewable with:
- Microsoft Powerpoint in Microsoft Office 2008 for Mac Home and Student Edition. You can download a free 30 day trial version.
- Impress in OpenOffice which is free. OpenOffice doesn’t display the .pptx files perfectly but it is good enough if you just want to be able to read the file.
- Keynote in Apple iWork. You can download a free 30 day trial version.