    Windows Registry Editor Version 5.00
    ; Change Extension's File Type 
    [HKEY_CURRENT_USER\Software\Classes\.jpg] 
    @="PhotoViewer.FileAssoc.Tiff" 
    ; Change Extension's File Type 
    [HKEY_CURRENT_USER\Software\Classes\.jpeg] 
    @="PhotoViewer.FileAssoc.Tiff" 
    ; Change Extension's File Type 
    [HKEY_CURRENT_USER\Software\Classes\.gif] 
    @="PhotoViewer.FileAssoc.Tiff" 
    ; Change Extension's File Type 
    [HKEY_CURRENT_USER\Software\Classes\.png] 
    @="PhotoViewer.FileAssoc.Tiff" 
    ; Change Extension's File Type 
    [HKEY_CURRENT_USER\Software\Classes\.bmp] 
    @="PhotoViewer.FileAssoc.Tiff" 
    ; Change Extension's File Type
    [HKEY_CURRENT_USER\Software\Classes\.pcx] 
    @="PhotoViewer.FileAssoc.Tiff" 
    ; Change Extension's File Type
    [HKEY_CURRENT_USER\Software\Classes\.tiff] 
    @="PhotoViewer.FileAssoc.Tiff" 
    ; Change Extension's File Type 
    [HKEY_CURRENT_USER\Software\Classes\.ico] 
    @="PhotoViewer.FileAssoc.Tiff"