Google hacking is a term that refers to the art of creating complex search engine queries in order to filter through large amounts of search results for information related to computer security. In its malicious format it can be used to detect websites that are vulnerable to numerous exploits and vulnerabilities as well as locate private, sensitive information about others, such as credit card numbers, social security numbers, and passwords. This filtering is performed by using advanced Google operators.

FileWin
http://www.filewin.com/
Using Google Hacks FileWin has created a search engine specially engineered to only search file’s based on there extensions. It can help you find torrents, mp3s, videos, images, ebooks, zip files, pdf’s, docs or any file extensions that you are looking for.

For example if you are looking for ‘Radiohead’s song Bullet proof’ you simply type “Bullet Proof” and in the second field you select MP3, hit search and the results will fetch you links to directly download MP3 Files of Bullet Proof.

The tool is quite fun to use as many people keep  there favorite songs & videos on there server but those files are not easily search able due to lack or popularity of the location. But with FileWin using Google it presents with results linking directly to the file. With this handy tool not only you can find free mp3’s to download but can also find allot of free pdf ebooks, zips and even torrent of movies you wish to download.

Other online File Search Engines

1. Files Tube
   http://www.filestube.com
   FilesTube.com is a another handy search engine though it does not use google’s hack but it is designed to crawl files in various file sharing and uploading sites. “With our unique approach to crawling you can find the files shared on uploading sites that the other crawlers miss. Also our search engine collects rich and relevant metadata for each page. As a result, when you search for files (video, music, software, documents etc) with FilesTube, you can always find high-quality, relevant search results.”
2. FileWatched
   http://www.filewatcher.com/
   Another Handy tools focuses on searching files & folder on ftp, i.e with this tool you can find the hidden vaults of internet filled with mp3, movies & books to download for free.
3. MetaFtP
   http://www.metaftp.com
   Another ftp search engine, which crawls and collects data from certain listed free ftp servers, if you got an ftp server and want to share your data you can submit it to metaftp. A gr8 tool to find files from ftp.
4. FileSnatcher
   http://www.filesnatcher.com
   File Snatcher is a search engine focused on finding files, mp3, software from online file sharing sites like rapidshare, badango, mediafire, sendspace & 4share. A handy tool if you want a quick search on all these five file sharing sites.
5. FilesBot
   http://www.filesbot.com/
   FilesBot is a search engine for content hosted on file sharing sites. Using FilesBot you can search in Rapidshare, Megaupload, Uploading.com and many others uploading sites and file hosting services