Cubase AI / MOXF8 / MidiOut ID in registry

I bought a Yamaha MOXF8, that included Cubase LE AI Elements 8. I’m running Windows 7 64 bit. During the installation process, it created registry entries for MOXF8 midi devices MOXF8-1 through MOXF8-5 which would allow Windows Media Player to send MIDI data to the MOXF8 when playing midi files (by changing another registry entry). The created registry entries look like this:

[HKEY_CURRENT_USER\Software\Microsoft\ActiveMovie\devenum{4EFE2452-168A-11D1-BC76-00C04FB9453B}\Yamaha MOXF6/MOXF8-1]
“FriendlyName”=“Yamaha MOXF6/MOXF8-1”
“CLSID”="{07B65360-C445-11CE-AFDE-00AA006C14F4}"
“FilterData”=hex:02 … 00
“MidiOutId”=dword:00000003

I then set the registry setting for default device to 3 (the MidiOutId) to get Windows Media Player to output to the MOXF8 (using MidiOutId = 3).

[HKEY_CURRENT_USER\Software\Microsoft\ActiveMovie\devenum{4EFE2452-168A-11D1-BC76-00C04FB9453B}\Default MidiOut Device]
“FriendlyName”=“Default MidiOut Device”
“CLSID”="{07B65360-C445-11CE-AFDE-00AA006C14F4}"
“FilterData”=hex:02 … 00
“MidiOutId”=dword:00000003

Recently the MidiOutId entries vanished from the registry. I tried running Cubase LA AI Elements 8 again, and went into device setup, but this did not help. I ended up doing a image backup on May 11, 2016, then restoring an image backup from Jan, 2016, then exported the registry entries to a separate partition. Then I restored the May 11, 2016 image and then "opened the exported registry entries to “reinstall” them.

What I haven’t been able to figure out is how these registry entries got created in the first place, or how I could have created them without having a prior backup that I used to export them with.