1st fully functioned file manager arrived in wp store compatible only for wp8.1 updated phones...

1st fully functioned file manager arrived in wp store compatible only for wp8.1 updated phones... its free so grab it fast. it has deeper integration with ur device..
u can create folders. move, copy, cut, paste, rename is availble also u can move any files from internal memory to sd card n vice versa...
also it can shows videos in ur devices...

Aerize Explorer | Windows Phone Apps+Games Store (United States)

official site - Aerize Explorer - Aerize Premium Windows Phone Apps and Utilities

try it n leave ur comments about it here.