If you've copied and pasted the recordings from your scanner to a folder on your computer, using Windows Explorer can reveal some of the information noted above. I believe it comes from the file headers.
The System Name is in the Contributing Artists column.
The Department Name is in the Genre column.
The Channel Name is in the Title column.
There's a subtle difference in the header if you look at it with a text or hex editor. I may try to hex-edit a file and see if it makes a difference.
EDIT: What I was aiming to do doesn't work. Having said that, VLC plays the x36HP files fine, but that means playing them one-at-a-time from Windows Explorer rather than playing them with all the metadata (fields) visible in MM.
I think perhaps the header data for the x36HP files is not quite up to the WAVE spec and VLC is just lenient on playing them back.