YES. We index most of the common document types. The list includes:
Text (.txt)
HTML (.html, .htm)
XML (.xml)
PDF (.pdf)
Word (.doc)
Excel (.xls)
PowerPoint (.ppt)
Visio (.vso)
Outlook
Archive Files (.zip, .tar)
OpenDocument (.odf)
Java (.java)
Rich Text Format (RTF)
More info at http://www.zukmo.com/faq.html