What kinds of file format are supported by the media server?
http://www.tp-ink.com/en/article/?faqid=506
How many files you can see? DLNA compatibility issue maybe.

Thank You for your reply Vivian.
All my files are mp3 and FLAC. Those that are visible are fully played without any trouble.
I have about 14 000 files but only about 800 are visible. Files are shown in the order of directories and ends in some on letter A. Rest of A and B, C, D..... to the end are not visible.
I used my PS3 as well as PC with Win7 64bit and Lubuntu 32bit. I used Windows Media Player, Windows Media Player Classic HC, VLC Player, Foobar 2000, Monkey Media Player.
The same effect everytime. I see all folders but only few files. If I enter into folders they are empty except some on A letter and earlier.
It looks like some kind of file limit is in TD-W8970 firmware or some bug ? Is it possible ?
Greetings!

It has limitaion indeed. About 1000 for W8970 V1 as I know. Some others may support up to 3000.