Default Extracting imgfs.bin

I want to extract the contents of an imgfs.bin file that comes from a Lumia 800 stock rom. I used nb7split to extract the files and now I'm stuck with the imgfs.bin file. Osbuilder reads it, even lets me see the struture and when I select the files to extract (wma or wav) it won't extract them to the folder.

What other option do I have?