Set the game to run in Windows XP (Service Pack 3) compatibility mode. This often helps the game engine process the .ini file correctly.
Right-click your game executable ( MW4Mercs.exe ) and select "Run as Administrator" to ensure it has permission to read the new file. Common Fixes for Mechset.ini Errors Mechset.ini File Download Free
If downloading a new file doesn't work immediately, try these "mech-hacks": Set the game to run in Windows XP
Since MechWarrior 4 was released for free years ago by MekTek, many fans still distribute the "Full Suite." If you download the community-maintained version of the game, you won't need to find the Mechset.ini separately—it will be included and pre-patched. How to Install and Configure the Mechset.ini File Common Fixes for Mechset
It stores your preferred screen size and refresh rate.
If there is already a Mechset.ini there, rename it to Mechset.ini.old .