Displays the "save file" dialog in the Assets folder of the project and returns the selected path name.

	// Opens a file selection dialog for a PNG file and saves a selected texture to the file.
	import System.IO;
	@MenuItem("Examples/Save Texture to file")
	static function Apply () {
		var texture : Texture2D = Selection.activeObject as Texture2D;
		if(!texture) {
			EditorUtility.DisplayDialog("Select Texture",
						    "You Must Select a Texture first!",
						    "Ok");
			return;
		}
		var path = EditorUtility.SaveFilePanelInProject("Save texture as PNG",
								texture.name + ".png",
								"png",
								"Please enter a file name to save the texture to");
		if(path.Length != 0) {
			// Convert the texture to a format compatible with EncodeToPNG
			if(texture.format != TextureFormat.ARGB32 && texture.format != TextureFormat.RGB24) {
				var newTexture = Texture2D(texture.width, texture.height);
				newTexture.SetPixels(texture.GetPixels(0),0);
				texture = newTexture;
			}
			var pngData = texture.EncodeToPNG();
			if(pngData != null) {
				File.WriteAllBytes(path, pngData);
				// As we are saving to the asset folder, tell Unity to scan for modified or new assets
				AssetDatabase.Refresh();
			}
		}
	}