I think i messed up my d2 files

[Uber-Soldat]

Ok. I accidently made my files in my Diablo2 folder (ones which were .mpq) open with notepad, anyone know how to to make them .mpq files again or which is the right program to open it with

Here is the list of files that were changed:

d2char
d2data
d2exp
d2music
d2sfx
d2speech
d2video
d2xtalk
patch_D2

(there is no .mpq or what ever they are suppossed to be because i changed the files to be opened by "Notepad" by accident)