Clara HD PNGs being synced/imported

So, the situation. I have set up my NickelMenu to use a custom icon, which is a png that I have loaded into the .kobo folder.

This is all working, except that my Kobo is now importing this image as a "book".

I am running the latest Firmware on a Clara HD.

I have added this to my Kobo Reader conf file, but it hasn't helped at all.

[FeatureSettings]
ExcludeSyncFolders=(\\.(?!kobo|adobe).*?|([^.][^/]*/)+\\..+)

Will appreciate any help I can get with this.