I think I've found a really and truly corrupt file. I've downloaded mahoraho_057.zip three times, using Opera and Firefox, on Win 2K and XP machines, and all three times it fully downloaded, the same file size each time, but Winzip reports that it is not a valid .ZIP file.
A search doesn't find anyone reporting this, so I'm reporting it now.
The chapter has been reuploaded and I confirmed it works this time. Thanks for bringing it to our attention.
Yup -- that fixed it. Thanks!