ARI Docs Viewer system plugin helps to embed remote pages, Joomla! articles and files in the following formats into any Joomla! content:

doc / docx - Microsoft Word Document
xls / xlsx - Microsoft Excel Spreadsheet
ppt / pptx - Microsoft PowerPoint
pps - PowerPoint Slideshow
odt - OpenDocument Text
ods - OpenDocument Spreadsheet
odp - OpenDocument Presentation
sxw - OpenOffice.org Writer Document
sxc - OpenOffice.org Calc Spreadsheet
sxi - OpenOffice.org Impress Presentation
wpd - Corel Word Perfect Document
pdf - Adobe Portable Document Format
rtf - Rich Text Format
html - Hyper Text Markup Language
txt - Plain Text Document
csv - Comma Separated Values
tsv - Tab Separated Values
pages - Apple Pages
ai - Adobe Illustrator
psd - Adobe Photoshop
dxf - Autodesk AutoCad
svg - Scalable Vector Graphics
eps / ps - PostScript
ttf - TrueType
xps - XML Paper Specification

One note, the extension uses online services for inserting documents into content so it requires internet connection. It means that this feature might not work on local network sites if they does not have access to the Internet.