Preserve objects when saving image using Faststone Capture Image Editor

Question

The Faststone Capture Image Editor ("FastStone Draw") allows you to annotate images with arrows, text, shapes etc. All these objects remain as vector-type objects and can be moved, resized, etc. You can close/open the "Draw" part of the editor and all the objects are retained, allowing further adjustment.

However, as soon as you save the image, it is "flattened" into a single raster image. (Even whilst the image is still open in the editor.)

Is there any way to save/export the image in a format that preserves all the annotation objects for later editing?

The only "Save As" options are BMP, GIF, JPEG, PCX, PNG, TGA, TIFF and PDF. (All but the PDF format can be opened.)