tar -zxvf <long ass file name> gets you strcmp.fat32 Mounting it gives you loads of errors, so you can't actually cd into any of them Googling the error gives us a tool of fsck. As it's a fat32 filesystem, we need to use fsck.vfat

sudo fsck.vfat -l -v -a -t ./strcmp.fat32

This gives us a load of files, but most noticeable is that the flag starts with PCTF So if we run it again, and grep for "P/C/T/F" we again get a load of results. If we look through those, we notice

P/C/T/F/P/P/C/T/F/{W/H/A/T/_/I/N/_/T/A/R/N/A/T/I/O/N/_/I/S/T/H/1/S_/F/I/L/E/S/Y/S}

That's not correct, but if we grep for that (excluding the "}" at the end) we find

P/C/T/F/P/P/C/T/F/{W/H/A/T/_/I/N/_/T/A/R/N/A/T/I/O/N/_/I/S/T/H/1/S_/F/I/L/E/S/Y/S/T/E/M/!}/SPACE/1

Flag: P/C/T/F/{WHAT_IN_TARNATION_IS_THIS_FILESYSTEM!}