P3M file extension

I didn’t no where exactly to put this so I apologize if its in a wrong place anyway here is the problem. I received this file with the extension p3m and I have no idea how to open it. I am not even sure what it is. I looked up stuff on it and I found out that it is some sort of verisign file and something to do with smime. So if anyone can get me more info I would appreciate it. Look I would not bother myself with it much but my boss insists on finding out exactly what it is... :confused:

Extsearch (http://extsearch.com/) had no records for p3m. My nagging feeling is, though, that is it is an mp3 file. Try renaming it and playing it to see.

Found some stuff that might be relevant.....

PDF file.....

http://www.xbrl.org/tr/2001/xbrl-2001-draft.pdf