I use the Win7 to host my dlna to my Smart TV.
Its a joke.
On the Smart TV I can find .avi files. But wont work with .mkv or .mp4 files. Wont support any subtitles. These are all Win7 and WMP caused issues.
And as you point out in the properties There is another filename in there that is a pain to change. The TV sorts by the properties filename when it would be 100% better if everything would use the visible filename in the explorer.
What used to be simple is now a myraid of properties and crap that makes our lives hell.
Buy a Mac Mini and load your content to iTunes, they are very reasonable: $499:
Run through an Apple TV or VLC
I run 500+ dvd’s/BluRays and 700 cd’s plus 100+ TV shows.
Simple to do.