user65916: After extracting all the files from the .zip file available at GitHub, which of the files do I need to open from the download in order to generate keys offline. Is it the bitaddress.org html file? Should I open it with my browser?

user65907: Yes, you open the HTML file in a web browser.
You can use either bitaddress.org.html or index.html   
Just so you know, none of the files are signed, so you can't verify the authenticity. I believe the devs just don't give a fuck anymore :D
To be on the safe side, disconnect from the internet before you run the key-generator.

65916: <p>After extracting all the files from the .zip file available at GitHub, which of the files do I need to open from the download in order to generate keys offline. Is it the bitaddress.org html file? Should I open it with my browser?</p>
 65907: <p>Yes, you open the HTML file in a web browser.<br>
You can use either bitaddress.org.html or index.html   </p>

<p>Just so you know, none of the files are signed, so you can't verify the authenticity. I believe the devs just don't give a fuck anymore :D<br>
To be on the safe side, disconnect from the internet before you run the key-generator.</p>
