When you save a backup file to removable media, such as a zip disk or floppy with Microsoft Money 2005, these files are created on the media, with zero length. They are not removed by Money.
An illustration of what you see is shown in the image below (note the 4 temporary files on the drive):
This is a bug with Microsoft Money 2005. It is, however, safe to remove these files.
This problem is fixed in Money 2006. Money 2006 also provides the ability to backup to other devices such as CDs and network drives. See
Keywords: rw?.tmp, 2006, 2005, backup, temporary file