I saw it between CorelDraw9 and Photoshop 5.5
I've tried to edit registry of Windows XP. Now, if I am trying to edit bitmap in CorelDraw 11 Photoshop starting but fails on loading.
By the way... if you will save an image in Photoshop, than select it and copy to clipboard, than paste it to Corel, than Photoshop will start automatically if you want to edit that bitmap. So, I am afraid, it is still possible, but I don't know exactly how ;(