change default home folder application for ctrl+super+E

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http://askubuntu.com – I went to keyboard application to set shortcut for home folder (set to ctrl+super+E as default) but for some reason it launches pcmanfm and not nautilus. tried several things such as edit files in /usr/share/applications or "gksudo nautilus /usr/share/applications" but i cannot find where is the setting that launches pcmanfm (at the files i can see Exec=nautilus %U). i'm using Ubuntu 12.10. Any ideas? (HowTos)