VMEM is a file extension associated with VMware Workstation package, which allows running other operating systems on given system as virtual machines. VMEM files are temporary files generated by the program during its operation.

Files with VMEM extension are paging files that can store guest system’s memory dumps. After th virtual machines has stopped running, VMEM files are automatically deleted, except for when an error occurs and the virtual machine crushes, which results in the VMEM files still present on the host system.