The CxACap WDM Audio Capture is a Windows driver that supports audio capture functionality through a WDM (Windows Driver Model) interface. It's typically associated with audio capture devices, such as sound cards or external audio interfaces, that enable the system to record audio.

The CxACap driver is often used by Microsoft Windows to facilitate communication between the operating system and hardware devices that are capable of recording sound. If you're experiencing issues with audio recording or if your audio capture device isn't functioning properly, you might need to install or update the CxACap driver.