how to export batch images form .cdr and saving them in serially

hi,

i have a around 500 cdr(corel draw ) files, and each pages have around 20 images in it.

so what i do. select every single image on the pages then using convert bitmap option to save them on my computer. That consume my whole time in saving them to my computer.

Is there any fast option available to select all images at once and convert to bitmap 20 images and save in a number say 1,2 ...20

i m not a corel draw expert, any suggestion will appreciated