I have been using it for a bit, but sometimes this really does act like a virus. Just today, I was wondering why my pc was chugging and when I checked my processes, there was the njws (which pointed to the mtool folder) which ate up a shitton of processor and ram.
I used mtool that day but closed it afterwards. Now I am not sure if its not a bug where it for some reason does not close, but it still does not make sense to use THAT many resources. My pc is pretty high end and it was eating as many resources as Lost Ark (ram and processor wise).