The file seems to have no MPQ archive header. The place one would expect it appears to be zeroed out, and one is not contained anywhere else in the file. There appears to be a huge amount of zeroed out regions of the file. In short that is one seriously corrupted file.
Although recovering some data could in theory be possible (I noticed some WC3 related strings), doing so is a lot of extremely painful work so I am pretty sure no one would do so for free. Also the data recovered may themselves be incomplete files or files that are easy to replace such as imports. I suggest restoring from a backup or protected version rather than trying to get anything out of that mess.