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.ppsx is the extension of MS PowerPoint.
Is there any program which can open this file type? It is not supported by OpenOffice nor by LibreOffice. The only way I can open it is launching a Windows virtualbox.
Libreoffice Impress (from version 4.1 and above) supports to open and edit .ppsx files.
You can install it from Canonical repository executing from terminal:
sudo apt-get install libreoffice-impress
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