How do you open folders by 'directory id' ?

I want to write an AppleScript that will open Eudora’s Attachments folder. Looking through the Eudora documentation on the Eudora site I found the following x-eudora-setting:
x-eudora-setting:45 Volume and directory id of the folder to which attachments are saved.
It returns a string in the format ‘Macintosh HD:1234’, where ‘Macintosh HD’ is the name of the hard drive containing the Attachments folder and ‘1234’ is the ‘directory id’ of the Attachments folder.
How do I tell the Finder to open the folder ‘1234’? The standard ‘open folder xyz of volume’ doesn’t seem to work. Do I need to prefix ‘1234’ with a class?

Hi,
If “1234” is a folder then its path ends with a colon:
tell app “Finder” activate – not necessary; brings “Finder” to the front open folder “Macintosh HD:1234:” end tell
gl, Kel.

My earlier post in this main thread explains how you can get the Attachments folder WITHOUT using the info from eudora-settings, as long as the Attachments folder is in the standard place. Maybe that will help.