I discovered a couple of useful S3 file browsers in addition to S3 Organizer. Cloudberry S3 Explorer is freeware, and is more capable than S3 Organizer, I think. It's a stand alone app, doesn't run in a browser. S3fm is a strictly web-based browser, so if you having issues with S3 Organizer, or are on a machine where you don't have access to S3 Organizer, it can be useful. Just need your Key ID and Secret ID, and you're off. I've had some issues with S3 Organizer on Win7 with "The difference between the request time and the current time is too large". This is apparently a common S3 problem. Changing the time server on Win7 to time.nist.gov from the default time server and clicking the "Update Now" button to force resyncing time, then waiting awhile seemed to fix this problem.