Can You Identify These Web Plug ins?

[wh2332]

After hearing about how trojans can affect mac computers through video file plugins, I decided to check my own folder. The plug ins which I cannot identify are
nsIQTScriptablePlugin.xpt
flashplayer.xpt
Can someone please tell me what these files are and whether they should be deleted?

Thanks

 

[wh2332]

Never Mind

I found that these were firefox files, and were no threat.