artie,

I trashed the "open any files" and the pop-up has gone.

'Trend Micro' was worded at the base of the pop-up window.

Thank you.

jaybass

OS 13.6.6 iMac (Retina 5K, 27", 2017, 3.4 GHz Intel Core i5, 24 GB RAM, 2400 MHz DDR4. SuperDuper. 1 TB Lacie HD