I noticed a few sites that would have thousands of 404 errors looking for the following files.
It turns out that it’s not a misconfiguration but rather how IOS devices look at the page. If you are on an IOS device and you save the page to your home screen it will basically be a thumbnail screen shot of the page. Once you create these files however, it will be your logo or whatever image you choose.
For my www.uniquemotorsports.com site, I took my favicon and re-sized it to 100×100 and saved it as a png with these files names. Once this was done it was a simple matter of uploading the files to the root directory of my website.