Originally Posted by Loceka
Still, I wonder how you managed to find out that the .html files in the archive were actually gzip files because gzip (on Linux) as well as 7zip (on Windows) are unable to open the ".html" files from the official Kobo dictionaries.
Sure (wb.html was extracted from the default kobo English dictionary):
# file /tmp/wb.html
/tmp/wb.html: gzip compressed data, from Unix, last modified: Thu May 26 10:47:26 2011, max compression
gzip/gunzip are very badly behaved - unix/linux programs are supposed to look at the contents, not care about the extension. gunzip -S html
will actually work, though.