It's actually stored on my internal SSD and therefore the path would look like this Though it might be somewhat different from what the others were doing before, basically I was using this "Make_WinPE 圆4" software to create a copy of PE_22000_US_L.wim first
I was able to boot that 88MB BOOT.WIM image on first try, though it's quite tricky to find the right 64-bit software to capture the screen since tons of them wouldn't work with such a stripped down version of PE.