Due to the Portal RTX Bridge being tailor made to work with the source engine, and especially those older executables, we need to install the bridge client.
For speed of installation, we have packaged together the core NVIDIA Bridge files from the Portal RTX release. This is the most recent as of
June 16th 2023 and may be subject to change. If you would like the latest file, carry on reading. Otherwise, you can simply download this zip and move on.
If you haven't already, you need to install Portal RTX from Steam. You can do so by heading over to the steam page and clicking install. Portal RTX is free for all to download, regardless of if you own Portal!
As this is a steam release, you'll want to head over to the Steam installation of Portal RTX and go through the
bin/ folder. The directory will be something like
As an example, my copy is located in
E:\Program Files\Steam\steamapps\common\Portal RTX\bin
There will be a lot of binary files here, but we are only looking for two.
The first is
The second is
Copy both of these files to your
Dark Messiah of Might and Magic Single Player directory. It will sit along side your
mm.exe file. Overwrite any conflicts.
Now that we have binaries, we need the Bridge executable so we can finally launch the game. In the
Portal RTX/bin folder you will now need to navigate into the
.trex folder. You will find a bunch of files here, but we are only taking the
Copy it and put it into your
Dark Messiah of Might and Magic Single Player/.trex directory and make sure to overwrite any conflicts. Note that we are now putting this
.exe into the
.trex folder, not the main Dark Messiah folder!