[HUMMINGBIRD] what does "don't load file" actually do, in advanced settings?

Since I'm the sole admin on (what's becoming a massive) multisite, i'm trying to find the most efficient methodologies with Hummingbird.

I noticed "don't load file" before, but stumbled for a quick second.

Does "don't load file" prevent the file from loading on the front end?
or
Does "don't load file" prevent the file from displaying in the Basic list of assets to minify?

In the hBird Documentation, it reads:
Excluding files – This will just exclude the file from the output.

...so, it's not really clear on the functionality.

Can anyone offer up any input on that?

thanks!

cheers,
splaquet