This article provides steps to modify advanced virtual machine settings (VMX) using vSphere or VMware Infrastructure Client.

VMware vCenter Server 5.5.x
VMware vSphere ESXi 5.0
VMware vSphere ESXi 5.1
VMware vCenter Server 4.1.x
VMware ESXi 3.5.x Installable
VMware ESX Server 3.5.x
VMware vCenter Server 6.0.x
VMware ESXi 4.0.x Installable
VMware ESX 4.1.x
VMware ESX 4.0.x
VMware ESXi 4.0.x Embedded
VMware vCenter Server 4.0.x
VMware ESXi 3.5.x Embedded
VMware vCenter Server 5.0.x
VMware vSphere ESXi 5.5
VMware vSphere ESXi 6.0
VMware ESXi 4.1.x Embedded
VMware ESXi 4.1.x Installable
VMware VirtualCenter 2.5.x
VMware vCenter Server 5.1.x

1. Ensure that the virtual machine is shutdown and is powered off.
2. Right-click on the virtual machine.
3. Click Edit Settings... to open the Virtual Machine Properties window.
4. Click the Options tab.
5. From the list on the left, click Advanced > General.
6. On the Configuration Parameters frame on the right, click Configuration Parameters....
7. Click Add Row.
8. On the new row, click under the Name column and specify the configuration option name.
9. On the new row, click under the Value column and specify the configuration value.
10. Start the virtual machine for the settings take effect.