MPQ opening problem

[shandia]

I've used model changing before for a long time and it worked good.
But some time ago by a mistake I managed to change so that I open MPQ files with a program instead of opening it with nothing. I chose to open it with notepad by a mistake and now modelchanging doesnt work.
Would appreciate if anyone knew why this happens and how to solve it.

[Sprayer0]

I don't really know the answer, but let's discuss. Did you delete something in the notepad? If not I guess opening it in notepad ruins the whole file.

[Turkeyman]

just open warcraft studio then open the mpq through the open mpq option?

[shandia]

Didnt delete anything in any mpq files just opened it