Permissions and Image Viewer

Hi all

We seem to have some strange behaviour going on with XP image viewer.

I am trying to set up a series of folders for people to view images
(actually scanned drawings).
On win2003 server I have given users read only permissions to folders,
subfolders and files.
I have applied these permissions by ticking "apply to child objects,
files...." at the top level folder. I have removed inherited permissions
from the top level folder.

On the advice of Miha Pihler I have copied files rather than move them from
a temporary scan folder to the structured library of folders.


Now the issue is:

If I go to a client PC with user access rights (read only), then opening
files that were in the library folders when the permissions were changed
produces different results to opening files which have subsequently been
copied there.
eg

original file - opens in viewer with annotation options unavailable
right clicking on file properties shows read only box ticked
selecting the option to change to image editor takes user straight into
image
attemting to save the image over the existing name generates unable to save
prompt


new copied file - opens in viewer with annotation options enabled
right clicking on file properties shows read only box not ticked
selecting the option to change to image editor results in a "read only file"
pop up message
attemting to save the image over the existing name generates unable to save
prompt

So the question is:

Why are files of the same type in the same folder with inherited properties
enabled behaving differently?

TIA

Phil