Using NT Service Pack 5 the drive letters in the "browse dialog" launched by pressing the "browse" button on the "setup type dialog" are not populated. I did try this on another NT Service Pack 5 machine (Don's) and the drive letters were being populated correctly. Not sure what in particular about my configuration makes this break.
Unable to reproduce with build 2000080323 on Windows NT SP6 and Windows 2000 Pro. Drives letters get shown just fine.
I've tested this with todays build and is still unable to reproduce...
Yes, this should be WORKSFORME/INVALID because I noticed this problem with other apps on my machine. System-specific problem.