• what’s the file called? • what’s inside the file? (Turn on view hidden folders if you have it turned off) • what did you think you were downloading? Was there a name or brand or anything associated with what you were downloading?

It may be a log file of some kind, the program you downloaded is probably somewhere in your program files or appdata folder or something and it’s just dumping a log of the application or some other random shizaz. The file itself is probably benign aside from being an annoyance, but the application you probably don’t want installed.

I would suggest going through a bunch of your directories on your C drive and trying to find where the program that’s causing the issues has decided it’s going to live. If you’re able to remove it I should expect the self replicating file will die along with it. Best of luck!