If you are looking to find out information of any file extension extensionfile.net gives you facility to search find out the information of any file extension.

For instance if you like to know what is .OCX file format and its explanation just enter OCX in search box, where you will get the complete information of OCX file and where it is implemented and history of OCX file.

You can also find list of file extensions displayed which is popular and mostly used by the users.

Visit : File Extension Database