Thanks for the howto but i was asking not only for me but others. If you are using a custom icon-theme you just found in the app manager you would not bother.. It would be a simple thing to implement and would optimize the download size of filebox. Instead of pointing to /opt/filebox/icons/icon.png it could point to /usr/share/icons/*variable*/48x48/icon.png. Where the variable get's the icon theme string from /etc/hildon/theme/gtk-2.0/gtkrc.