Google's advanced search supports these formats:

• Adobe Acrobat PDF (.pdf)
• Adobe Postscript (.ps)
• Autodesk DWF (.dwf)
• Google Earth KML (.kml)
• Google Earth KMZ (.kmz)
• Microsoft Excel (.xls)
• Microsoft Powerpoint (.ppt)
• Microsoft Word (.doc)
• Rich Text Format (.rtf)
• Shockwave Flash (.swf)

So if you content in these formats and want them ijndex they should be in your sitemap.

Google's advanced search shows that Google supports these formats:

• Adobe Acrobat PDF (.pdf)
• Adobe Postscript (.ps)
• Autodesk DWF (.dwf)
• Google Earth KML (.kml)
• Google Earth KMZ (.kmz)
• Microsoft Excel (.xls)
• Microsoft Powerpoint (.ppt)
• Microsoft Word (.doc)
• Rich Text Format (.rtf)
• Shockwave Flash (.swf)

So if your content in these formats and want them index they should be in your sitemap.