The K-Lite Codec Pack is a collection of audio and video codecs for Microsoft Windows DirectShow that enables an operating system and its software to play various audio and video formats generally not supported by the operating system itself.

Moreover, the ffdshow processing filters are still kept, and new options to load them in all compatible DirectShow players are added.

[10] The K-Lite Codec Pack supports the following file formats:[11] As of 27 October 2009[update], CNET reported a total of 1,074,578 downloads for K-Lite Mega Codec Pack 5.2 since its release date of 12 October 2009.

[12] Meanwhile, CNET reported only 122,552 downloads for K-Lite Codec Pack Full Edition 5.2 (released on the same date); however, it also received an average user rating of 4.5 out of 5 stars, albeit from only seven reviewers.

On the same date, Betanews Fileforum reported a rating of 4.7 out of 5, based on 2,346 votes for K-Lite Mega Codec Pack 5.2.0 and 9,416,511 downloads.

In October 2009, Softpedia reported K-Lite Mega Codec Pack 5.2 and K-Lite Codec Pack 5.2 Update had been downloaded a combined total of 2,011,113 times after their release on 12 October 2009, and gave them a user rating of 4.4 out of 5 based on 2,281 votes.

[16] Also in October 2009, SnapFiles also highly praised K-Lite Codec Pack Full edition, giving it five stars.