My fully open source patcher (dxmsfix) is a more recent improvement on his. Mine automatically searches for a DX directory using a pretty complete list of possible directories (Steam, GOG etc.), doesn't care whether you select the DX root directory or the System directory, is fully compatible with Kentie's by modifying any config files found in My Documents and tells you when your settings are already up-to-date.
Screenshot:

We're advising newcomers to the DXMP Discord to use dxmsfix to make the process of getting access to multiplayer completely foolproof. Maybe it'll be helpful to some people here. I'm posting it just in case.

Download link (hosted by Kai): https://dxmp.gitlab.io/kb/dxmsfix.exe