In System Folder:
Macromedia Folder, containing
(1) Help Folder, with
Macromedia help Player 4.0
(2) Xtras Folder, with
BMP Import Export
GIF Import Export
JPEG ditto
LRG ditto
MIX Services
Photoshop 3.0 Import
PNG Import Export
Targa ditto
TIFF ditto
and also in System Folder, in Extensions...