0len_zip_header.wad

Not actually a WAD file.

This one is archived in a zip file where the "compressed size"
and "uncompressed size" attributes have been specifically zeroed
in the file entry and the proper data is available only in the
zip's central directory. Such zip file should extract properly.

A real world zip file that is like that is John Romero's e1m8b:
https://www.doomworld.com/idgames/levels/doom/Ports/d-f/e1m8b
