PurchaseOrderRequest.dtd file given is corrupted

this file which comes during the installation is corrupted; Could anyone please send the correct version ?

Is your PO file based Rosettanet DTD pip3A4?

This is what is given in the DTD :

I’m new to this area…
Please advice…

This file is located in the folder
webmethods\Integrationserver4packages
wmbpi4devtrn\pub

I need this file for doing preliminary study