Finally home again from a deployment. Updated Windows (and a bunch of other stuff)
Creators Edition update (or whatever it's called) installed. Before the CE update, I did leave for a day while copying my external HDD MAME directory onto my system... but it shouldn't have caused this... I noticed there was something in my recycle bin, so I go to empty it... and it's deleting 63GB of temp files! WTF? Did those come from the update?
First thing I noticed was they removed the command prompt from the power user menu in favor of powershell. Never having messed with powershell much, and knowing my 3DS tools are set to build everything just fine from CMD, I took care of that little problem right away.
Now I guess it's time to update my softwarelist stuff...
I will be the last person to die in my lifetime.