.VMX File Extension

Configuration file used by VMware virtualization software such as VMware Workstation and VMware Fusion; stores settings for a virtual machine created with the New Virtual Machine Wizard; includes the memory, hard disk, and processor limit settings; enables a virtual machine to be started in the software.

VMX files are saved in a plain text format and contain a list of settings in the form of property = value. For example, the setting for the memory limit may be memsize = "512", which means that 512MB of RAM is the maximum memory allowed for the virtual machine.

VMX files saved for VMware Fusion are generally stored within a .VMWAREVM package.

NOTE: If the virtual machine was created with an earlier Linux version of VMware Workstation, the configuration file may use the .CFG extension.

Configuration file used by Steinberg music production software programs, such as Cubase and V-STack; contains channel and effects settings for an audio mixer; used to save and load custom mixer configurations.

Map backup file created by Source SDK, an SDK used to modify games provided by Valve's Steam gaming service; contains a backup of a .VMF map file created by the Hammer Editor component of the Source SDK.

Hammer Editor automatically create a VMX file when a VMF map file is saved. Therefore, they can be used to revert a map back to the last save point.