OK, what you do is, within the RTS program, you click on File|Save as and you woll see a window similar to the atached show up. You give it a name, and pull down the file type list (see red arrow) and select bitmap. This will convert the RTS file to a bitmap (bmp). Save it where ever you like on the
Next you open the bitmap you just created using some photo software, Xnview, or The GIMP. Resize to 640 X 480 or smaller, and save as jpg. This will usually be a similar manner as teh save as in the RTS software, but depends on what photo software you have.