Installing NW04 SR1 WAS640 on NT

We are trying to install XI (3.0) on an NT server to connect to R/3 (ECC5.0) on iSeries AS400. The first step of the XI installation is to install the NW04 WAS 640. The NW04 SR1 installation DVD listing has for the first DVD the SAP NW04 SR1 SAP (UNICODE) KERNEL 6.4 <Database>. Our question is what Kernel is this for? Our DVD are for the iSeries where R/3 was installed we are installing NW04 on an NT server. Do we need the Kernel for NT? Or is the Kernel for the iSeries sufficient as it will be connecting to the iSeries?

Any help is appreciated!