There are 3 file types use the .VMX file extension:
1. VMware Configuration File

- Developer VMware
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Popularity
- Category Settings Files
- Format Text
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.
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Updated: June 4, 2018
2. Valve Map Backup File

- Developer Valve
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Popularity
- Category Game Files
- Format Text
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.
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Updated: October 25, 2010
3. Cubase Mixer Settings File

- Developer N/A
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Popularity
- Category Settings Files
- Format Binary
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.
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Updated: December 7, 2009