This article explains how to use Apple AirPlay on Windows using various third-party applications. Check the individual software requirements to ensure compatibility with your version of Windows.
Can you use AirPlay with a Windows PC?
Basic AirPlay audio streaming is built into the Windows version of iTunes. Simply install iTunes on your PC and connect to the Wi-Fi network hosting the devices, then you’re ready to stream music from your computer to compatible audio devices.
Non-audio streaming via AirPlay requires a Mac. You can stream media from almost any application, including applications that don't support AirPlay, since the features are part of the macOS operating system. For example, if you're using the desktop version of a music app that doesn't support AirPlay, you can use macOS to send music to your wireless speakers.
This method will not work for PC users, as AirPlay on Windows only exists as part of iTunes, separate from the operating system.