FYI - I got these warnings when upgrading from v3.1.1.0 (x86) to v3.5.0.1. I think it's more of a problem with RPM though since it doesn't quite handle switching between symlinks and files too well (or vice versa). I ended up uninstalling and reinstalling the RPM to make sure it doesn't keep happening in the future.

[root@localhost v3]# rpm -Uvh nerolinux-3.5.0.1-x86.rpm
Preparing... ########################################### [100%]
1:nerolinux ########################################### [100%]
ln: `/usr/share/mime/packages/nerolinux.xml': File exists
ln: `/usr/share/icons/gnome/16x16/mimetypes/gnome-mime-application-x-nero-disc-image.png': File exists
ln: `/usr/share/icons/gnome/16x16/mimetypes/gnome-mime-application-x-nero-linux-compilation.png': File exists
ln: `/usr/share/icons/gnome/24x24/mimetypes/gnome-mime-application-x-nero-disc-image.png': File exists
ln: `/usr/share/icons/gnome/24x24/mimetypes/gnome-mime-application-x-nero-linux-compilation.png': File exists
ln: `/usr/share/icons/gnome/32x32/mimetypes/gnome-mime-application-x-nero-disc-image.png': File exists
ln: `/usr/share/icons/gnome/32x32/mimetypes/gnome-mime-application-x-nero-linux-compilation.png': File exists
ln: `/usr/share/icons/gnome/48x48/mimetypes/gnome-mime-application-x-nero-disc-image.png': File exists
ln: `/usr/share/icons/gnome/48x48/mimetypes/gnome-mime-application-x-nero-linux-compilation.png': File exists
ln: `/usr/share/mimelnk/application/x-nero-disc-image.desktop': File exists
ln: `/usr/share/mimelnk/application/x-nero-linux-compilation.desktop': File exists