There are no known Cinema 4D issues that are Windows 10-specific but your user experience might differ, depending on your hardware. Our closed field test showed that some but not all GPU drivers or input device drivers work less reliably on the new operating system, especially when using third-party plugins that rely on these drivers. This can change anytime if these drivers are updated, which means that no general guidelines exist regarding which graphics cards will be affected. For users of Intel HD2500 / HD4000 GPUs, we don't recommend the use of Windows 10 because they will most likely not receive the necessary updates.
QuickTime: Some versions could not be used with Windows 10. However, we received positive feedback with regard to using the current version 7.7.9 with Windows and Cinema 4D. According to the website, there is no official support for Windows 10. Download: https://support.apple.com/downloads/quicktime