Google can now index the following file types. There are 13 main file types searched by Google in addition to standard web formatted documents in HTML.

The most common formats are PDF, PostScript, Microsoft Office formats:

·         Adobe Portable Document Format (pdf)

·         Adobe PostScript (ps)

·         Lotus 1-2-3 (wk1, wk2, wk3, wk4, wk5, wki, wks, wku)

·         Lotus WordPro (lwp)

·         MacWrite (mw)

·         Microsoft Excel (xls)

·         Microsoft PowerPoint (ppt)

·         Microsoft Word (doc)

·         Microsoft Works (wks, wps, wdb)

·         Microsoft Write (wri)

·         Rich Text Format (rtf)

·         Shockwave Flash (swf)

·         Text (ans, txt)

Google is also scouring the Web for additional file types that are very rare. You may see them pop up in your results from time to time. 

Standard HTML is best fro search engines.

This is marvelous! However standard HTML is always the best to create web pages as we do not know the status of numerous other search engines and their ability to index other file types. However it is a sigh of relief that most common file types are taken care of at least by Google.

When you are creating your site, go for a common file type and be safe.

Next : Submit everywhere