On my hunt to find an answer, I came across an answer to the opposite question, how to find which file occupies a sector (on Windows, use nfi.exe from the Windows 2000 OEM toolkit).
From what I know, finding the sector(s) a file is occupying is quite possible as a program I had used called Ultimate Defrag does this (for fragmented files in it's list).
Does anyone know of a program that will report the sector(s) a file occupies on NTFS?