Monoslideshow 1.3

Anyone got any suggestions, i’m trying to install Monoslideshow to display my Flickr images on my K2 site but when i go to upload the edited ‘.xml’ file it tells me;

“File type does not meet security guidelines. Try another.
Back to Image Uploading”

But i need the ‘.xml’ file to feed the ‘.swf’… or so i think? I’m quite new, so be gentle. Any ideas?

Thanks,
Ant