It seems that Ladik's MPQ editor can't fully open that mpq, only showing part of the content and the rest are files called File0000000.x or something similar.
Other mpqs work fine though.
I tried redownloading both the program and the file but nothing seems to change.
On the contrary, WinMPQ doesn't start when i try to open it (i used the fix in its folder), with no errors shown.