Following this link https://help.ubuntu.com/community/AddingMimeTypes, I first typed a command to discover the mimetype for psd extension
~$ grep 'psd' /etc/mime.types image/x-photoshop psd
Then I took Photoshop CS5 SVG image from Wikipedia and renamed it to
image-x-photoshop.svg. Then I copied the file to the folder
/usr/share/icons/gnome/scalable via command
sudo cp image-x-photoshop.svg /usr/share/icons/gnome/scalable/image-x-photoshop.svg
Loogged out, logged in, but the icon for the .psd files is still unchanged.
Does anyone know what I am doing wrong? I use Ubuntu 10.10.
Thanks in advance