Pk3 extension stands for Archive files. You will need Dragon Unpacker software to run pk3 files.

It is a file compression method that generally used with games. There are different games that use pk3 files such as 
Quake III, Return to Castle Wolfenstein, Medal of Honor, Heavy Metal: F.A.K. You are able to open pk3 files with the latest version of Winzip software. Also, pk3 files can be opened by Dragon Unpacker. You can download Winzip free from different websites. 

What to use pk3

Dragon Unpacker

which page related to pk3 file

pk3 Related Searches

You can check related links about pk3 fileextension.