Error while extracting installation file.

Hi Experts,

We are installing sap NW 7. I have downloaded all DVDs required.We have

following zip files downloaded from portal.

51033506_5.ZIP

51044870_1.ZIP

51044873.ZIP

I am trying to unzip these files by right click - extract. But it

asking to give me passwords for diff files (eg. 'BUILD INFO' file). Can any one please advice which password it is asking for & from where I can give it.

Thanks & Regards

Amar V Jogalekar.