Cause Sometimes, a file arrives from the Internet when you choose to download it without the right kind of file extension. Windows XP does not know what kind of file the file is or what to do with the file without an extension.
The Pain Killer In most cases, all you need to do is right-click the file and rename it with a valid extension. For example, let's say you download a picture file named Picture. Simply right-click the File icon, click Rename, and give the photo the name of picture.jpg (or you can try picture.bmp). This will help Windows XP identify the file as a picture file so that programs can open the file. If this does not work, try downloading the file again in case there were transmission problems or errors.
