You can enable Mass Storage Mode on your BB, and they your compter will read it like it's removable media. To enable the mode to to options, memory, then set Mass Storage Mode Support to On, and Auto Enable to On or Prompt.
You can also set up a briefcase through mass storage mode and use the bb as the storage device. This way, you can put a file on your bb and everytime you connect you can update the file. A work around for syncing files.