On our two Thinkpad Carbon X1 PCs now running Windows 10, the usual one-line command in our backup script (for many years in Windows XP, 7, 8, etc.), which is now
c:/Program Files/CCleaner/CCleaner64.exe /AUTO
is giving us:
[0x7FFE0F4AA2E0] ANOMALY: meaningless REX prefix used
[0x7FFE0F49F700] ANOMALY: meaningless REX prefix used