Adding a new document type and file type icon

To add a document type and type icon, do the following:

1. In the Program Files\Common Files\Microsoft Shared\web server extensions\50\Templates\1033\xml directory, open DOCICON.XML.
2. In the middle of the file, find the ByExtension section.
3. For the sake of example, we will add a wav file type and an icon to represent what kind of file it is. Add a line like the following:

   <Mapping Key="wav" Value="icwav.gif"/> 

4. In the Program Files\Common Files\Microsoft Shared\web server extensions\50\Templates\1033\Images directory, add an appropriate icon and call it "icwav.gif".
5. Restart Microsoft Internet Information Services (IIS).
6. Create a new subweb.All sites created from now on will display icwav.gif in document libraries for files that have the .wav extension.