Have you ever opened up a video file only to get an error that it cannot be played. Or maybe you can at least hear the audio but see a blank screen. Well, in all probability you have the required codecs missing.
Microsoft sure has a lot of running work to do. Just a day after a Zero Day flaw was detected in Word, a new flaw has been detected in Windows Media Player. There is a detailed explanation for it as below: The Windows Media Player library WMVCORE.