It seems to be used for other things too. The ESE technology, which has been around for a while and seems to have been used extensively in Exchange and Active Directory, seems to also be in use by Windows 10 for storing information regarding the Live Tiles that make up the Start Menu/Screen. It turns out that this file is the redo log for the Microsoft Extensible Storage Engine - aka database manager. I dug into the issue a bit, and it is clear that the cause is because the edb.log file is somehow corrupt. Parallels 11, Windows 10 - both up to date with patches. I ran into this exact same issue this morning.
