The extension can be changed, the file you have could be anything. Are you sure it is a media file? Scan it with security software. Try CCCP Media Player Classic and if it plays, check its property and change the extension type. Also it can a a disk image, mount it with virtual drive and read it.
Are you trying to open a file from an installed game folder and look for videos, sounds and images?
Does the folder where the bin file is, got another file with *.cue extension?
Cause it's more likely you could open the bin if you could find it's *.cue file and mount that.
For mounting files I recommend Winmount or Daemon Tools.
But if you want to extract videos, sounds or images from game files I would go with DragonUnpacker program.