You could of PM'd me to check the thread

First time I've seen it.
You could do two things.
1. Generate a batch script as you mentioned.
2. Create two apps, one for generating a dat file and then one that the user can use to read in the dat file and make the necessary changes on the client side.... kind of like an upgrade utility.
Use FSO (file system object) to write the text file
http://www.sloppycode.net/fso/?m=61
You can definately use an app to write registry entries.
Do you have any specific questions?