I'm sorry if this has already been asked. I just had a really hard time searching for exactly what I need to do. There are only so many keywords to use.

An application we use is hosted externally of our network. Our users access these servers via custom RDP files that connect to *abcd.example.com*. We have been informed that we now need to have all of our users connect to *wxyz.example.com* instead. 

This will likely cause us to have to "touch" every custom RDP file on all 300 PCs to manually change them to point to *wxyz.example.com*.  

(Sending out a single updated file is not an option, unfortunately)

We do not own *example.com*

Is there any way to use our internal DNS Servers (AD) to answer the request for *abcd.example.com (1.2.3.4)* and return the result for *wxyz.example.com (1.2.3.5)*?  

It looks like AD DNS is very authoritative and will take over ALL (internal) resolution for *example.com*. Since there are many other hosts at *example.com* that we need access to (ftp. www. support. etc...) I can't have it answer every request for that domain.

Thank you, and sorry for the long question.