Check out the Unified File System tech-note (http://www.episerver.com/downloads/Documents/TechNotes/EPiServer%204.61/2.%20Operation,%20Configuration%20&%20Security/Unified%20File%20System.pdf) with particular reference to the versioned file system. Basically, you'll need to create a folder, give the ASPNET/NETWORK SERVICE (XP/Server 2003) account write access (assuming you're uploading / modifying files), copy the summary.config file from a development environment to that folder (amending it if you want to change file 'meta' information), then add a section to web.config as described in the tech-note. Keeping the folder name/location the same as in the development environment means you should just be able to copy the docrepository section from that environment to the new environment's web.config

Thanks! Works great!