fsearch
Fsearch is files search engine, where you can search:-
Documents - doc, docx, rtf, txt, odt and wpd formats.
Spreadsheets - xls, xlsx, csv, wks and wps formats. Presentations - ppt, pptx and odp formats. Archived - zip, rar, tar, tar.gz, tar.bz2, 7z, cab, lhz, tar.gzh and yz1 formats. Go to http://fsearch.infobind.com