add extensions to autocomplete tab key and other

Hi, I've searched the forum ana everything but I haven't found how to add popular extension to tab autocomplete, i.e. .mkv or .mp3, so when I complete the .mkv file it will launch windows associated program automatically.
It will works if I write the filename alone by itself so i need just the autocomplete.

The other configuration i need is to enable backspace as go up one level in TCC file explorer.

Thanks for your help