WDS Compatibility
From ERPXE Wiki
ERPXE works with WDS but we do not recommend it as a default TFTP service.
WDS uses "c:\RemoteInstall\Boot\x86\", "C:\RemoteInstall\Boot\x64\" or "c:\RemoteInstall\Boot\ia64\" as "/tftpboot/" so you'll have to keep 2-3 copies of ERPXE , one for each CPU Arch - x86,x64,ia64.
NFS and HTTP plugins will need modifications to work.