Good News: You can point to a shared folder in a different server to store files in a FileMaker container, mapped drive, external drive, mounted drive, etc .
Bad News: The previous function does not work when you host the database in your FileMaker server, even if the same file directory is available. FileMaker hosting will change that to a folder INSIDE the FileMaker Server databases folder why? Your guess here _____________.
In conclusion: You STILL have to use a plug-in to handle useful file management functions.
Remark: This is the half-done feature for FileMaker 12.