Many Windows based video users have been concerned lately regarding security flaws which led Apple to pull all support for Quicktime for Windows, with the Federal Government going so far as recommending that Windows users completely remove it from their system.
Apple is now doing to Quicktime what Adobe did to Flash a few years ago. Not for the same reasons, but the impact is similar.
Apple has stopped updating its Quicktime software for Windows and now the United States Computer Emergency Readiness Team issued an Alert (TA16105-A), which recommends Windows users uninstall Apple QuickTime from their computers. While I’d guess Quicktime was not the favorite player for many, there are several dependencies within Premiere that will make this move very unpopular with video editors.