Update only changed files (unreg and reg)

[JMcIntosh]

I have the need to update a very large program on a network.  This program will get updated often and has well over 100+ dll's.  It is running on win98 and xp desktops.  It was easy to get updates pushed out by using xcopy and having it reference a network location and compare the dates there against the dates on the local computers and then only copy the updated files down from the network.  This works great!  but now I have the need to make changes to the batch file so that it will unregister newly copied dll's and then re re-register them.  At first I just had it just doing an unreg to all files in the dir on the local computer but like I said there are over 100+ and growing so it was taking about 10 minutes to unreg and re-reg.  So does anyone know how I can have it unreg and re-reg just the files that were xcopied by newer date ??

It would be a process for updating 1500+ PC about once a week.  

Thanks