In searching for a quick, simple, free ISO extraction tool, I found a post on Donny Mack's blog about the Microsoft Virtual CD Control Panel v2. One of the myriad of cool tools available from Microsoft that they don't really advertise. All it does is allow you to mount an ISO as logical drive, but that's all I wanted.

The tool is unsupported, so if it frags your system you're SOL. As Donny mentions, it does work on non-XP systems (I just successfully used it on a Win2k workstation).

The readme (included in the download) has instructions for "installation" and use.