There is only one file type that uses the .VMPL extension:
VMware Policy File
File used by VMware, an application used for running Windows, Linux, and other operating systems as virtual machines; defines authorizations and restrictions for the virtual machine; specifies access control to resources such as DVD-ROM drives, the company network, and the Internet.
VMPL files are created with VMware ACE, a product used mostly in enterprise environments. Policy files are useful in this context when employees work from remote locations using VMs.
NOTE: VMware ACE was discontinued at the end of 2011.
Updated: April 24, 2012