I was searching for a problem and i found some like mine,looking at some old posts.
So,i was modding a game and i opened a file with notepad(a few minutes i was trying to resolve)but i give up and open with utorrent(i was very angry)
Later i watched a tutorial.
I go to regedit.... to txd file,delete from OpenListWith(all,except default)and remove folder UserChoice.
Please help when i open the files txd,he go me to utorrent.
Thanks and sorry if i wrong some words.English is not my native language