VMX may refer to: Computing Virtual Machine Extensions, instructions on processors with x86 virtualization AltiVec, a floating point and integer SIMD instruction set called VMX by IBM vMX 3D, an Ethernet router in the Juniper MX-Series by Juniper Networks .vmx, a filename extension for virtual machine configuration files used by VMware Other uses Vintage motocross VMX (TalkTalk), an on-demand music television service VMX (Voice Message Exchange), a voicemail company