Just following tail's suggestion to report this: Using Bash on Ubuntu on Windows10 (as administrator in Windows contect)
adminb@GREY2:~$ tail -f /mnt/c/Windows/System32//LogFiles/Firewall/pfirewall.log
tail: unrecognized file system type 0x53464846 for ‘/mnt/c/Windows/System32//LogFiles/Firewall/pfirewall.log’. please report this to bug-coreutils@gnu.org. reverting to polling
-- Joe Wronski jdwron...@gmail.com