Saving Images With alpha?

hi there, is there a way to save PNG images with alpha? but save them from a Downloaded Blend and save them on my Hard disk, thanks

save it from the UV/Image Editor as PNG

yeah i know, but i want to save an image and when i save it still having the alpha, but when i save it, it losses the alpha :frowning:

Under render settings, in the output panel, choose RGBA instead of RGB.

go on the file menu then external data and then in unpack into files, blender ll unpack the textures without change their propertyes