Thank you for your post.
This was changed in a later release. Using FileMaker Pro, pull down the File menu and select Sharing -> FileMaker Network... In the lower half of the dialog box, select the file on the left side, and on the right side, there are options for "Network access to file". Below those options is a checkbox that reads "Don't display in Open Remote File dialog". Enter a checkmark and the file will not be listed.
Please let me know if you need additional clarification.