I wonder if it has to do with the unstandardized nature of WAV tagging.
I think this is where the issue is.
When I open the WAV I ripped in tag editor, the track number is there. But the tag inspector is completely blank.
When I open the properties in Windows Explorer, all tags are blank. None of them is editable.EDIT: By updating to 3.3.7460, the tags do show up in the explorer.
As glad2bnfla mentioned WMP could rip them correctly, I gave it a try.
All the tags does show up, although none of them is editable.
It seems that WMP has managed to find a way to write the tag into WAV files, but due to the nature of WAV, the tags cannot be edited.
EDIT: I apologize for misunderstanding your issue when I first replied. I mistakenly thought that you were saying the track number was missing from file name. My first replies must've been confusing.