How 2 examine xp registry files from vista pc

[SillyOpaJim]

Hello,
Vista PC has an XP's C: drive mounted as a USB. I want to examine/view/search the XP's registry files to recover an application's password (if that's where the app stored the password to begin with). Yes, I own the app on the XP's C: drive.
How 2?

 

[PhilFrisbie]

Try running REGEDT32 and loading the hive from the USB attached drive.

 

[SillyOpaJim]

Try running REGEDT32 and loading the hive from the USB attached drive.

A little more procedural directions would be helpful, like how do I load the Hive?