Yep, those are all separate IRs. Each IR is like a snapshot of the response of a certain mic on a certain speaker on a certain cab, at a certain distance, angle, etc. So all those files are reflective of all those variables.
I only have the free pack from Ownhammer, but my download had a Line6 folder included. Even if it doesn't, I think you can use any of the wav files in there - Ownhammer separates them into folders for convenience of the people using the different modelers. (Somebody please correct me if that's not right).
It's a lot to load in to the Helix just to weed out ones you don't like. If you do any kind of recording on your computer, you might be able to try what I did. I recorded a quick noodle in my DAW and added an amp simulation but no cab. Then I used an IR loader to cycle through the ownhammer folder and see which ones I liked best. It's still a lot to go through, but it's quicker and less of a commitment than loading them on to the Helix to try them out. Generally if I don't like the way they sound in my DAW, I won't like them in the Helix either.