cannot read files in zip file after installing jde 2.3.5

[Yoon Kyung Koo]

After installing jde 2.3.5 I cannot read files embedded in zip or jar file.
The error message is as follows :

Searching for program: no such file or directory, pkunzip

I use unzip instead of pkunzip.
;;  use unzip instead of pkunzip
(setq archive-zip-use-pkzip nil)