See Reply # 393 by bob3160 re disabling IE 11. https://forum.avast.com/index.php?topic=93544.msg1503361#msg1503361
Now have a look at a snip from CCleaner with IE 11 disabled on Win 10 1809. See attached below:
If IE 11 has been disabled, why do these files show up for cleaning?
Is this the first use of Ccleaner since IE11 was disabled ???
Nope.
CCleaner was run before IE 11 was disabled, and has been run three times after rebooting and switching user desktops more than once to check to see if IE was indeed actually disabled. I can provide several more like the first one if you like.
Easiest way to remove cleaning findings would be to untick all categories in place in CCleaner for IE, reboot and then scan again. Wouldn’t find anything since IE isn’t being scanned anymore but that is not why this post was made. It seems as if IE is still running anyway?
This isn’t that strange with IE of the past even when not the default browser it did other things outside of browsing.
But given the actual sizes of the files removed, I wouldn’t think it is active, just default settings in the event of it being used.
The next time you run ccleaner, don’t delet these and take a look inside the .txt, .htm, .xml files and see what the content is.
That directory structure is rebuilt periodically by the OS, even if IE is never invoked (I haven’t used it in over a year).
If I permanently delete it (Shift+Del), or use one of my batch “cleanup” routines, within 15 minutes or so it is back. It happens when any browser is used 
@ DavidR,
Had a look at the 4 files and, yup, one of them returns to FF even tho IE hasn’t been run in some time.
@ alanb,
Learn something new everyday, it is appreciated.