Confused by Wiki Instructions to make Win isos w/ VirtIO drivers- Please clarify

I’m confused by the instructions on the Wiki that say to copy boot.wim and install.wim back to the sources folder of the ISO file, because these files didn’t change when I ran the script “win7-inject”. They’re still in the iso just the same as they are outside the iso as they’ve been extracted- they haven’t been modified, their timestamp remains the same.

All the script “win7-inject” did was add 2 dirs to the /tmp/win7 folder called /tmp/win7/bootwim & /tmp/win7/installwim.

/win7/bootwim has in it /win7/bootwim/1 & /win7/bootwim/2, and all of these dirs are empty.

/win7/installwim has in it /win7/installwim/1, /win7/installwim/2, /win7/installwim/3 & /win7/installwim4

In /win7/installwim/1 is /win7/installwim/1/Program Files/VirtIO & /win7/installwim/1/Windows/Setup/Scripts
& in /win7/installwim/2 is /win7/installwim/2/Program Files/VirtIO & /win7/installwim/2/Windows/Setup/Scripts
& in /win7/installwim/3 is /win7/installwim/3/Program Files/VirtIO & /win7/installwim/3/Windows/Setup/Scripts
& in /win7/installwim/4 is /win7/installwim/4/Program Files/VirtIO & /win7/installwim/4/Windows/Setup/Scripts

Each of the VirtIO dirs have all the VirtIO drivers in them from the VirtIO iso, & the Scripts dirs have the SetupComplete scripts in them.

Do I replace the boot.wim file with this bootwim dir? And the install.wim file with the installwim dir?

Do I leave the boot.wim & the install.wim files there in the iso & put these dirs in there with them, or do I remove them since these dirs are replacing them?

Please advise.