I am trying to create a completely responsive website and would like to use a.svg graphic for the site logo, but DNN prevents me from uploading or using an SVG graphic, although the filetype is authorized in the host settings.

does anyone know how to do this?

Sebastian,
James said SVG is authorized in his host settings.

James,
I think the problem is that there's a filter applied to the drop-down/selection list for the portal Logo file.
I'm seeing, in the code, that there's some type of global list of image file extensions. Not sure where that list is, though, and how it could be modified.
I suspect that's what you're going to need to do other than modifying the skin itself and embedding the SVG file in the skin itself (instead of a logo placeholder).

Adding the extension in Via the list editor in the Host menu worked.

Thank You