Recently we've had to download a pre-patch. In this pre-patch there are files.
Let's looks a bit closer at the path to the files mentioned above. In the directory "Star Trek Online\Live\prepatch\piggs" we find the following files:
Am I the only one who finds that HOGG files in PIGGS directory sounds porcine?
It's definately a bit of an in-joke. .hogg is just a container file (like a .zip or .rar but without the compression), so they tend to be realy big, the programers probably decided to call them pigs because of that. Champions also has .hogg files. I think City of Heroes had .pigg files which they put into a piggs directory. When they updated the Engine the directory kept the name but the new file format changed to .hogg to continue the joke.
It's always fun finding those kinds of thing in game data.