DVDA5.2 works correctly with VP10. It was included in the update package from 9 to 10. Serial was included
Remember VP 9 runs with DVDA5.0. You can have both DVDA 5 & 5.2 installed at the same time.
If you then uninstall DVDA5.0 it will stop 5.2 working. You will now need to uninstall 5.2 & re install it.
Dolby Pro_AC3 will now be working in VP10 but not VP9.
If you again need Dolby Pro_AC3 in VP 9 then DVDA5.0 will have to be reinstalled.
Just updated my XP system and had forgotten this problem which I first encountered on W7.