How to Find the Software to Open File with Unknown Extensions

FINDING THE SOFTWARE TO OPEN THE FILE WITH UNKNOWN EXTENSIONS
It is a biggest problem for the beginners to find the software to open the file with unknown extensions...Most of the users depend on the Google
Search engine to find the software to open the file with unknown extensions...........But it take time to get the Answer to find it.There fore we are going to use the Search engine built especially built for this purpose...............!
Make a note of the extension of the file of which you want to get the software.........to open......
After making a note go to the Wolfarm Alpha and enter the extension without the dot.......and hit search that's it.You can a list of some softwares which can open the file.....And you even download the Wolfarm Alpha software for your iPhone.....
For example if  you want of for the applications which can open the .xls then simply type the following code in the search box and hit enter then you can see all the application which can support the format to open your file