file GD2 for graphics Library

[brunovr]

hi, 
how can i do to make and read the GD2 file graphics ? (example nightw.gd2)
I'm not been able to open file, i'm try Photoshop an other...

i have a Mac or Xp .

thank's a lot

Bruno

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Edit :

I have to create icons for change pages, not sprite, so i read with LOAD ASSETS()