This really should come as no surprise to folks in our industry, as Apple's support of QuickTime on Windows has waned over many years. It's also important to understand that I.T. is going to take a global approach to the new vulnerabilities, and will likely force removal of QuickTime from all hosts they control/manage. Your job, should you choose to accept it, is to explain to them why you are an exception, and to learn more about the available options and solutions to address your environment and needs. There are options.