Additionally try this:
Mechstorm High Definition Patch for the latest version of the Free Release of MW4: Mercenaries.
http://www.mechstorm...c.php?f=5&t=801
Also, GameRanger:
http://www.gameranger.com/
Getting Mercs working with GameRanger:
If you downloaded through MekTek's MTX program follow all of the following steps.
First off, Download and Install GameRanger.
Next, go into the folder structure that starts with mektek.net/mechwarrior mercenaries - mektek mekpak.
Start by renaming the folder named:
mektek.net
Rename this folder to:
mektek
Next, rename the following folder:
Mechwarrior Mercenaries - MekTek MekPak
Rename this folder to:
MechwarriorMercenaries
It is helpful to note that there are no spaces in-between the two words.
Following this, start up GameRanger, or if you have it running, go to Edit - Options from the dropdown menu.
Go to the "Games" tab and find Mechwarrior 4: Mercenaries and point it to the
MW4Mercs.exe
You should now be set for playing Mercs over GameRanger.
Hopefully, anyone should be able to host using this method.