If this is a photo of an invasive plant, you should upload it to the Weeds Australia portal to assist local biosecurity efforts.
If it is a software skin, move the .png file into the "Skins" or "Textures" folder of the relevant application. weed_skin.png
Could you clarify if this file is a you need identified or a graphic design file you're trying to install? If this is a photo of an invasive