Currently FolderChooser loads the two files at runtime.
If you want you can add an ImageList with the two image files and change:
Code:
tree.AddImage1(AppPath & "\folder.bmp")
tree.AddImage1(AppPath & "\openFolder.bmp")
To:
Code:
tree.AddImage1(ImageList1.Item(0))
tree.AddImage1(ImageList1.Item(1))
That will cause the images to be embedded in the executable.