Reminds me of when I was into making secret codes so I could "encrypt" information in settings files in any programs I made... and of course to write in it when I was bored.
Given how similar it looks, I'm going to suggest this is also a homebrew code.
EDIT: Just found the code I made. This is how eerily similar it looks. Here is a sentence...
. .:. .:.. _. ..: _. :_: _:_ :.:.:
Heh.
ANYWAY WHAT IS EET