KDE Office Open XML Document Thumbnailer
KDE thumbnailer plugin for Microsoft Office Open XML Documents. This plugin should support all ooxml documents with thumbnails saved, including docx pptx ppsx xlsx files. However, most docx and xlsx documents do not have thumbnail image saved along with document body, you may not see the previews. It only depends on qt and kde library. You do not need any office suite installed to make this plugin work.