Random unknown files keep reappearing

Hello!

I've had this problem for a long time, but have yet to figure out why it keeps happening. I'm pretty sure it was from some program or something I've downloaded in the past (I've downloaded a lot of things in the past couple years), but I can't figure out what, where, why.

These files keep appearing under my "Downloads" folder. It'll be a whole slew of them with jibberish names. I'll delete them, and then they reappear within a day or so.

They're all ".file" files.

Is there a way to track down what 3rd party software could be doing this?