What type of Files Google can index

Google can index the content of most types of pages and files. The most common file types Google index include:

1. Adobe Flash (.swf)
2. Adobe Portable Document Format (.pdf)
3. Adobe PostScript (.ps)
4. Autodesk Design Web Format (.dwf)
5. Google Earth (.kml, .kmz)
6. GPS eXchange Format (.gpx)
7. Hancom Hanword (.hwp)
8. HTML (.htm, .html, other file extensions)
9. Microsoft Excel (.xls, .xlsx)
10. Microsoft PowerPoint (.ppt, .pptx)
11. Microsoft Word (.doc, .docx)
12. OpenOffice presentation (.odp)
13. OpenOffice spreadsheet (.ods)
14. OpenOffice text (.odt)
15. Rich Text Format (.rtf, .wri)
16. Scalable Vector Graphics (.svg)
17. TeX/LaTeX (.tex)
18. Text (.txt, .text, other file extensions), including source code in common programming languages:
19. Basic source code (.bas)
20. C/C++ source code (.c, .cc, .cpp, .cxx, .h, .hpp)
21. C# source code (.cs)
22. Java source code (.java)
23. Perl source code (.pl)
24. Python source code (.py)
25. Wireless Markup Language (.wml, .wap)
26. XML (.xml)

When you use the filetype: operator in a Google search (for example, filetype:xml galway), Google searches for files with the .xml extension, not for files of file type XML.

Not all URLs or pages have the .html file extension. Some pages (like http://www.google.com) have no extension at all, and some have an extension that doesn't match their file type. Limiting your search to a specific file type will return pages with that file extension, and may return fewer relevant results.

Source:- support.google.com/webmasters/bin/answer.py?hl=en&answer=35287

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