The Goal
You need to explore which image that you want to grab from adobe flash file, just look into adobe flash library, you cannot edit with… using popup menu, the adobe flash will ask you the original file to locate, and said it error !. Now, what are you doing, you just explore and try every single of possibilities, to get those files.

The Final
Ah, why you don’t create new scene in adobe flash, while the original adobe flash that you want to grab the file from library still open. Just create new scene, then put library item file to new scene, from there use menu File->Export->Export Image, then save these image with the name as you want.

Finally you got what you want, the file that you want to use to design the web from adobe flash, without ringing your client asking to send image resource for your design. Got it.