In this challenge we need to open another type of file.
After downloading the challenge files, we get a bunch of .gbr files.
After some additional internet browsing I find out these are called gerber files.
The community/gerbv package on archilnux provides the views that can open these files.
After opening the files I see the following:
Now I decided to hide/unhide layers as that was the only action I knew how to do.
After some trial and error, the following parts of the flag were revealed:
The final symbol of the second part was an @, which gave me a bit of a hard time, but the flag was submitted.