What are these? Do they make sense to you? Ok, I admit; some of you might say they are different file formats. Nevertheless, can you identify the meaning of them?
In such case, you might look upon wikipedia.org to get the details. Here is a website called FileInfo that provides information on nearly all digital file formats.
Many times, the files we download won't open with our default programs. Unless we know which program would open that file, our downloaded file would be useless.
FileInfo has got all those thousands of file extensions listed and offer information on programs that would open them.
Very useful website located at http://www.fileinfo.com/