I assume the archive type used is .zip ? you did not mention.
I've managed to carve through the content, and i've not found anything related to bitcoin, yet.
There is content which could be from Adobe Photoshop, as there is lots of PK content (.zip files) with *.model files
If the story is true, that might be the reason, that i've had no luck to recover any filesystem, as the DVD was never finalized.
Are we looking for a wallet.dat file stored in a .zip file? any extra information would maybe help