An empty path is either an empty absolute path or an empty relative path.
An empty absolute path is the path to the highest point in the file hierarchy. An empty absolute path in a path control appears as an empty string and when you wire it to a file I/O function, it refers to the list of drives associated with the computer.
Macintosh An empty absolute path in a path control appears as an empty string and when you wire it to a file I/O function, the empty path refers to the desktop, which includes all mounted volumes.
UNIX An empty absolute path in a path control appears as a slash (/) and when you wire it to a file I/O function, the empty path refers to the root directory.
An empty relative path is the path that, when appended to another path, results in the other path. This path is represented as a period (.).
Macintosh The path is represented as a colon (:).
UNIX The path is represented as a period (.).