What does it mean?

Your browser does not recognize the file online or network site you are visiting. Read the paper do not necessarily graphics - they can be sound files, movie clips, Zip files, or sit down, and so on. If this is not a GIF or JPEG file, your browser may not know what it is.

What can you do about it?

The dialog box, the implementation of this message will usually provide clues to the missing file types. (You may see some garbled on the byte stream, but you may see some graphics TIFF, threw it.) To help you look at the computing platform (Mac or PC) of the audience the most common document. And then follow your browser instructions to assign a file format for each audience to view online. Refer also to Helper application not found.