Can web.config add an IIS mime mapping to allow serving a non standard file extension?

[Dave]

I am hosting on a GoDaddy server and need the server to serve a file
extension that is currently not server.

My understanding is in general there are no filetype restrictions but that
if any filetypes are added tot he MIME mapping in IIS then any non-standard
filetypes must be mentioned.

In any event, is there some way in web.config I can request that IIS allow
serving up filetype .xxx or whatever rather than having to configure this in
IIS which I cannot do on a server I do not own.

Thanks,
Dave

 

[Dave]

Is there any other way to do this other than to configure IIS?

Thanks,

Dave