In this post, you’ll learn more about the Error ERROR_FLT_NOT_INITIALIZED – 0x801F0007 that is returned when working with the COM-based APIs in Win32
Win32 COM Error
ERROR_FLT_NOT_INITIALIZED – 0x801F0007
Win32 COM Error Error Description
The Filter Manager was not initialized when a filter tried to register. Make sure that the Filter Manager is getting loaded as a driver.