.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.

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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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