After copying a file using "dd" command, how can I open that single file which contains an entire usb drive?

I copied an entire flash drive to a hdd as a single file using the dd command. Then I copied that single file to external media using a different dd command, below. The file is of "unknown kind" and about 8GB, the size of the original usb drive.

I can not find anything online about how to open this file and view all the files inside. The "man dd" pages doesn't seem to mention anything about it.
Code:"sudo dd if=/directory/filename bs=16M of=/file.path/new.file.name"