There are situations where you get a file from your friend with unknown extension through email, or you downloaded a file from internet which you don’t know much about? What you will do is use Google to find more about that? wait there is a web app for that, gives detailed information about any file extension. provides detailed information about any file extensions not just limited to Microsoft Windows but also for MAC OSX, Unix based operating systems also.This online service contains huge database about file extensions.

file extension info-dotwhat

For example search for MKV extension will provide info about type of file, details about software program that opens that file in Windows as well in Mac Operating Systems.User can find any extension selecting first character of extensions and can know much more by browsing through various categories of file types offered on this website.

Want desktop app to tell about programs that can open unknown files you can use tool.

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