Keygen Nero 4.0.3.9 I Looked For A KEYGEN For Nero And I Found Many With This Extension "php". I Don't Know What Program Open It?

I looked for a KEYGEN for Nero and I found many with this extension "php". I don't know what program open it? - keygen nero 4.0.3.9

I downloaded the wrong file. Keygen ends. "Exe"
. PHP file is a Web page.