I dunno... I'm running Little Snitch registered, and I've got no such file, visible or invisible.

Also, unless LS has changed over the years I've been a registered user the demo is freely and easily renewable for as long as you want to deal with the bother (every 6 hours as I recall).

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire