VLFNMEM.SYS

This driver is part of Virtual Long Filename Support Driver (VLFN) that allows DOS VDM sessions to have long filenamed files support.

VLFNMEM.SYS is a (character) device driver. It's only job is to reserve 128K memory as a communication buffer between VLFN.SYS and VLFND.EXE, and give the address of this buffer to everybody who asks for it.