Weird file Windows made up loads on start after homegroup tomfoolery

I was just resolving a "Windows cannot set up a homegroup on this computer." message. It turned out I needed to re-enable services I never disabled under Administrative Tools.

Prior to that I tried disallowing Windows' homegroup management under Advanced sharing settings and logging off, then of course undid it. Which is where I guess this began. Now after startup I'm always greeted with this:



What? Really? My username is 'Pixel Eater', so what's this file Windows has invented and how do I make it stop? In Notepad it simply reads:

===========================================================================
Interface List
13...(mac address removed) ......Marvell Yukon 88E8056 PCI-E Gigabit Ethernet Controller #2
1...........................Software Loopback Interface 1
12...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter
15...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface
===========================================================================

IPv4 Route Table
===========================================================================
Active Routes:
None
Persistent Routes:
None

IPv6 Route Table
===========================================================================
Active Routes:
None
Persistent Routes:
None

Okay, the too cool for an extension file was under C:\Users and ceased loading after deletion. I guess I still wonder if there's an entry somewhere attempting to start it or if it was a property of the file itself or something with the Users folder.

If not, I'm just curious what or why the file was.