EditorUtility.SaveFilePanel  

static function SaveFilePanel (title : String, directory : String, defaultName : String, extension : String) : String

Description

Displays the "save file" dialog and returns the selected path name.

See Also: OpenFilePanel function.

Save File Panel.

// Opens a file selection dialog for a PNG file and saves a selected texture to the file.

import System.IO;

class EditorUtilitySaveFilePanel {

    @MenuItem("Examples/Save Texture to file")
    static function Apply () {

        var texture : Texture2D = Selection.activeObject as Texture2D;
        if (texture == null) {
            EditorUtility.DisplayDialog(
                "Select Texture",
                "You Must Select a Texture first!",
                "Ok");
            return;
        }

        var path = EditorUtility.SaveFilePanel(
                "Save texture as PNG",
                "",
                texture.name + ".png",
                "png");

        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);
        }
    }
}