Only copy files if updated

Hi,

I would like to download some files from a central source server onto all
the desktop clients on our network. I want to deploy these files via group
policy logon scripts. However due to the size of the files (approx 30 Mb)
after the first copy I only want the files to be copied if they have been
changed.

For example if I update config.xml on the central server that one file would
be copied down to all the clients (the next time they log on) however the
remaining files in the folder wouldn't be copied as they are unchanged.

I've been trying to find a way to do this via WSH or a batch file, does any
one have a suggestion? Unfortunately my knowledge of WSH isn't great.

If anyone is interested it's for a corporate screensaver which cycles
through various images, the idea is we change the images occassionally, for
example at Christmas time etc and they will automatically download the
changed images when the PC reboots.

Many thanks,

Jon


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