That contains all the DirectShow filters that are required to play QuickTime files. If you want to play QuickTime files in Windows Media Player or another DirectShow based player, then it is recommended to install the K-Lite Codec Pack. Other players require DirectShow filters to be able to play QuickTime files. Media Player Classic and ZoomPlayer are capable of playing QuickTime files by using the QuickTime framework that gets installed by QuickTime Alternative.
Ability to make an unattended installation.QuickTime Alternative is a trimmed down version of QuickTime that contains only the essential components needed for playing QuickTime content that is embedded in webpages.