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Powerful PPTX Editor can be free tried for one day without any restriction on function.

Powerful PPTX Editor is a presentation program resembling Microsoft PowerPoint.

The most important function is that it can view and edit .ppt,.pptx files which is create by Microsoft PowerPoint.
Of course, it can also create .ppt and .pptx documents too.

Once you get it , you can open, view, edit, save and print many common files.
That is very useful and interesting.

Powerful PPTX Editor can open many file formats
-Microsoft PowerPoint 2007-2016 (.pptx)
-Microsoft PowerPoint 97–2003 (.ppt .pps .pot)
-Apple Keynote (.KTH .KEY)
-Photo CD (.PCD)

In addition to above of these, it can still edit other many common file formats
such as .doc .docx .xls .xlsx .pdf and so on.

And the presentations can be exported as SWF files, allowing them to be viewed on any computer with Adobe Flash Player installed.