Does each file have three parts?

UNIX stores Macintosh files in three forks: the data fork, the resource fork, and the finder information fork. The data fork contains the actual data contained in the file, the resource fork indicates the application to launch when you open the file, and the finder information fork maintains data about the file's creator, type, location on the desktop, and icon.

TAS stores these parts in separate directories. When you create a file from a Macintosh client, TAS writes the data fork writes to the current directory, the resource fork to the subdirectory .tnatr:reso-fork, and the finder information to the file .tnatr:intf. If TAS cannot locate all of these pieces, the file may not launch correctly. In versions of TAS previous to 5.x, TAS writes the data fork to the current directory, the resource fork to the .resource directory and the finder information to the .finderinfo directory.