The cache file is a ".z" file which winrar thinks is an archive. It isn't of course because winrar complains when it tries to open it. Does it need to be extracted? The tool seems to work without it being there.
A bit of humour - the voice interprets G. as gram so 1 G. Caelis gets announced as 1 gram sealy.
A bit of humour - the voice interprets G. as gram so 1 G. Caelis gets announced as 1 gram sealy.