Image Type EXF

[Philip]

I am using an asp:image control to reference a image type with an extention
of "EXF". When testing with VS.NET 2005 (WXP-IIS5.1)... the EXF image type
is retreived fine.....however when I move to a production IIS6.0 environment
IIS refuses to send the image type EXF.

The Accept header (both for vs.net 2005/IIS5.1 and IIS6.0) specifies the
following...

image/gif, image/x-xbitmap, image/jpeg, image/pjpeg,
application/x-shockwave-flash, application/vnd.ms-excel,
application/vnd.ms-powerpoint, application/msword, */*


Any ideas ?

Thanks