CCM subfolder SensorFramework contains unreadable files

Finding this issue on several Windows 10 PCs.  After uninstalling the SCCM client, folder SensorFramework remains and can't be deleted.  Contains 3 or more files that are not readable and security/ownership can't be changed, with names such as "c4eaa67d-dd9a-4fce-0002-000000000000.008".  I can't find any documentation on this folder in the CCM directory.  Anyone know what this folder is for?

Thanks,

Russell