creating a patch installer

Hi. I just want to know, how can I create a patch installer application in vb.net? You see, we have a windows application that was deployed in several (network) disconnected locations. Several modules of the application have been updated. I want to create an installer that will replace the old files of the application with the new ones. Is there an easy way in VS.Net to do this (like when creating a setup project)? Or do I have to create this from scratch? Thanks.

I have used Setup projects to do a simple file copy as part of an installation, so you ought to be able to do what you're planning. I don't know enough about Setup projects to say for sure though. When I try to build a Setup project that just does a file copy of one file it errors with 2714 (invalid default folder name, which I am guessing is because I don't have any Application directory). I'm sure it's just a matter of fiddling with it though.