Needs the Gestalt Manager (since System 6.0.4) to check if the FindFolder function is available (since System 7.0). Also for some folder types the Process Manager (since System 7.0) needs to be available. If it is available all folder types mentioned above can be passed.
In general all features are available with System 7 and higher, and with System 6.0.x there are some exceptions.
Under System 6 this external provides some glue code to return the path to the system folder when you query for the following folder types: 'ctrl', 'extn' and 'macs'. In addition it will now return for types 'pref' and 'prnt' the path to the 'Preferences' and 'Spool Folder' respectively. If these folders don't exist they are created. For the Spool Folder the external tries to use the name stored in the System file, when unable to find it, 'Spool Folder' is used.
The external uses the PathNameFromDirID function described in the 'Getting a Full Pathname' (M.FL.FullPathName) Technical Note last modified in June 1989. Because the File Manager should be able to handle both paths containing slashes (used with A/UX) or colons the external doesn't explicitly use slashes. All paths returned by the external will contain directories and documents separated by colons, and it expects only paths with colons as input.
