.CREC File Extension
File TypeLync Video File
What is a CREC file?
A CREC file is a video file created by Microsoft Lync, a business instant messaging and video conferencing application. It contains video recorded from an online video meeting that can be played back by the user.
CREC files were used by the 2010 version of Lync but were replaced by .MP4 files with the release of Lync 2013. If you still have Lync 2010, you should publish your video conference recordings as .WMV files in order to view them.
NOTE: Lync was replaced by Microsoft Skype for Business.