It's the Windows 10 Mobile emulator image for Hyper-V... you can remove it unless you want to have a Win10 Mobile emulator running for some reason.
To uninstall:
Uninstall Windows 10 for Mobile Image
When you install the emulator, a Windows 10 for Mobile VHD image is installed, which gets its own entry in the Programs and Features list in the Control Panel. If you wish to uninstall the image, find Windows 10 for Mobile Image - in the list of installed programs, right-click on it, and choose Uninstall.
In the current release, you must then manually delete the VHD file for the emulator. If you installed the emulator to the default path, the VHD file is at C:\Program Files (x86)\Windows Kits\10\Emulation\Mobile\flash.vhd.
Source
Don't have Hyper-V, I think this was installed by Visual Studio 2015 to emulate Windows 10 Mobile devices for Universal Apps development... – Dean Kuga – 2016-05-05T22:56:06.000
Your comment should be an answer if you are sure. – Moab – 2016-05-05T23:19:19.890
1@Moab If I was sure, I wouldn't start the sentence with "I think"... – Dean Kuga – 2017-05-11T17:57:04.053