background picture of icon view options in SL

It seems, at least at my house, if I set the background picture of icon view options of window of folder, to change the background image of a folder, in Snow Leopard, the folder, when copied to a Leopard machine does not display the background.

Here’s more or less what I’m doing. For testing, I put an image file named “my.png” inside a new folder named “test_folder” on the desktop. I run this script to choose the folder and set its bg img to the my.png file it contains:

tell me to set x to ((choose folder) as text)
set bgimg to ((x as text) & "my.png") as text
tell application "Finder" to set background picture of icon view options of window of folder (x as text) to bgimg

It works on both Leopard and Snow Leopard. But when a folder so treated on Snow Leopard is copied to Leopard, the image does not display. Going from Leopard to Snow Leopard works as expected.

Any thoughts appreciated, as usual.