*Do any experts exist on this ng who know how to make that port work?*

If another Windows 10 user can test either of those two failed solutions,
we will get a better idea if it's Windows 10, or if it's just me.

WiFi:
Here is the detailed thread showing how to use WiFi FTP to map network
locations to named removable drives on Windows if the users don't already
know how from using Linux.
https://groups.google.com/forum/#!topic/comp.mobile.android/IswZ5yEcpYA
Note that there's a minor typo in one command which won't faze most users:
ftp open 192.168.1.6 2221 (your IP address & port may well differ)

USB:
To answer Paul's question about USB libMTP documentation, there's a readme:
C:\software\network\mtp\libmtp\README.windows.txt
Which says, summarized:
LibMTP depends on LibUSB and libiconv.
o LibUSB Win32 - http://libusb-win32.sourceforge.net/
o LibIconv - http://gnuwin32.sourceforge.net/packages/libiconv.htm
LibMTP takes advantage of the LibUSB-Win32 Device Driver package.

Hence the steps to use freeware to get Android 4.3+ to connect to
Windows as a drive letter so that any Windows command can run directly
on the Android filesystem appears to be as summarized below.

1. Download the latest device driver binary package (libusb-win32-device-bin-x.x.x.x.tar.gz) from http://sourceforge.net/project/showf...group_id=78138
2. Upon extraction, plug in your Android device and run bin/inf-wizard.exe.
Select your device and save the resulting inf file in the project root directory.
3. Copy the files "bin/libusb0.dll" and "libusb0.sys" for 32-bit operating systems.
Copy the files "libusb0_x64.dll" and "libusb0_x64.sys" for 64-bit operating systems.
4. Goto Start - Run, type "devmgmt.msc" and press "ok".
5. Select your Android device from the list and click Action - Update Driver,
Choose "No, not this time" if prompted to connect to microsoft.
6. Choose "Install from a list or specific location".
7. Choose "Don't search, I will choose the driver to install
8. Click the "Have Disk..." button in the bottom right corner of the prompt
9. Browse to your .inf file and select it. Press Ok
10. The name of your Android device should appear in the prompt,
click it and click "Next" (Ignore any prompts about Driver Signing,
continuing installation of the selected driver).
11. Click finish to end the driver install process.

If needed, to roll back to the original Android USB driver:
1. Goto Start - Run, type "devmgmt.msc" and press "ok".
2. Select your Android device, right click on it and click "Properties"
3. Go to the "Driver" pane and select "Roll Back Driver".

I'll run as many of those steps as I can, but I'm not a coder.
I'm an empirical tester. I run things until they work.

If I'm successful, this will be a first (to my knowledge) where almost
nobody knows how to do this, AFAIK, and where the power is immense
in that we can connect Android as a drive letter over USB using only
Windows freeware so that _all_ Windows commands run on the Android
filesystem.