Freenk

Hi, hope you don't mind me asking you a question directly like this. About 90% of the files I open in GIMP have a grey/black squares, like this: http://www-personal.umich.edu/~bazald/l/faq/gimp_transparency.png (denoting transparency) overlaying the textures. How can edit those files? GIMP says it's only 1 layer..