Here's a little program I made that will display the sheets text files in an easy to read format...
No, it does NOT unpack the full version OP2 files... but it will work for the demo files.
It requires vb6 runtimes to run... You probably already have them (like for the multi server) but if not, just search google for "VB 6 Runtime".
Also, the VOL must be unpacked already... it doesn't have the capability to read the VOL, only the text files inside.