Out of control ShellExtIO.log file from bitorrent sync

Its a known issue, but since I'd rather not manually mess with the registry, I used a few well known tools to delete this file. The issue should be fixed with newer builds

I did two things - firstly I used shellextview to disable any explorer shell extensions related to bitorrent sync. Resilio Sync (the newer build) has its own, so no clue why these where still there. I'm not sure if its essential, and if it actually helped, since I couldn't delete the file after that

Then I used sysinternals process explorer to identify any process with handles on the file - using ctrl F to search for it,

For some reason firefox, whatpulse and explorer had handles so I closed firefox and whatpulse, and removed the handles for explorer through process explorer - just rightclick and close any that are there

This let me delete the file the usual way.