_ Desktop. ini. MSF what is it?

I installed a set of software on the last day and shut down the kabbaseline for a while. After all the software was installed, I opened the Kaspersky. The report showed that many of them were infected with the virus. So let's just kill it. Because EXE is killed, many small software must be reinstalled at a loss :(

At night, I scanned the entire disk and killed many. EXE files. You should have done it. Opened the Thunderbird email this morning and found a lot more _ desktop. the INI folder cannot be deleted either. Go to the path where the email is saved and check that there is a _ desktop in each folder. ini. MSF file, delete all, re-open Thunderbird, again, depressed, is there a virus? I searched the internet and didn't find any post about _ desktop. ini. MSF. I'm upset :(

What exactly is it? It's different from _ desktop. ini.