0 -- (blank) -- Uses the default icon for the object.  
1 -- Generic "Handshake" (default icon for TOKEN/ARG objects)
2 -- Document (default icon for ARTICLE and INTL_ARTICLE objects)
3 -- Folder (default icon for COLLECTION, FORM, and OLD_FORM objects)
4 -- Chat  (default icon for CONFERENCE objects) 
5 -- Auditorium (default icon for AUDITORIUM objects)
6 -- Diskettes (default icon for SOFT_LIB objects)
7 -- Message Board (default icon for MSG_BOARD objects)
8 -- Open Book (default icon for SEARCH_DB and  OLD_SEARCH_DB objects)
9 -- Bullet
10 -- Check Mark
11 -- Checkbox
12 --  Disk
13 --  Frown
14 -- Grid
15 -- Letter Document
16 -- Mailbox
17 -- Pen
18 -- Watch
19 -- No Mail
20 -- Speaker
21 --  Music Note
22 -- Smile
23 -- Dotted Document
24 -- Box
25 -- Large Check Mark
26 -- Checked Disk
27 --  Apple

Note:  The Windows platform does not support mini-icons 17-27.