Enter following keywords in Google search with your desired filetype and category and all files will directly be available form Google search. If some of file type are not present here you can just replace it with your desired filetype.

Here are All the keywords

filetype:ASP ASP
filetype:ASPX ASPX
filetype:BML BML
filetype:cfg ks intext:rootpw -sample -test -howto
filetype:cfm "cfapplication name" password
filetype:CFM CFM
filetype:CGI CGI
filetype:conf inurl:psybnc.conf "USER.PASS=" 
filetype:dat "password.dat
filetype:DIFF DIFF
filetype:DLL DLL
filetype:DOC DOC
filetype:FCGI FCGI
filetype:HTM HTM
filetype:HTML HTML
filetype:inf sysprep
filetype:JHTML JHTML
filetype:JSP JSP
filetype:log inurl:password.log
filetype:MV MV
filetype:pdf "Assessment Report" nessus
filetype:PDF PDF
filetype:PHP PHP
filetype:PHP3 PHP3
filetype:PHP4 PHP4
filetype:PHTML PHTML
filetype:PL PL
filetype:PPT PPT
filetype:PS PS
filetype:SHTML SHTML
filetype:STM STM
filetype:SWF SWF
filetype:TXT TXT
filetype:XLS XLS