Document Preview File Types

I am trying to find a list of all the file types that the document preview in a SharePoint Online environment supports. By this I mean the preview must show the contents of the document, and not just the metadata.
Does anyone know of a list I can reference?

Basically its all the standard office document types and PDF.  Its the same list as the document types supported by Office Web Apps since that is what does the preview.  Here's a support article that explains what Office Web apps supports. 
PDF files are handled the same as .DOCX
Paul Stork SharePoint Server MVP
Principal Architect: Blue Chip Consulting Group
Twitter: Follow @pstork
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