problems opening files.

[Mii1234]

I was following a tutorial on how to Texture, and i went to open the 'war3x' file... apparently, my computer thinks that it's supposed to be opened with notepad, and warcraft 3 viewer cant touch it. i trid to open it with notepad just to see what would happen, and it said notepad cant open this type of file.

ok... ive been able to change the 'open with' to Warcraft 3 Viewer, but the treeview doesnt work, and there seems to be no effect when i open it.

does anyone know how i can fix this?

please respond as soon as you can.