[Bug 26662] Re: file-roller fails to open .Z files

[Vassilis Pandis]

You're right. file-roller actually looks for both compress and uncompress, while only the latter exists, even if all we want to do is uncompress. gzip doesn't handle compressing files to .Z format, only uncompressing them.

from src/fr-command-tar.c: 

 if ((prog == FR_COMPRESS_PROGRAM_COMPRESS) &&
            ((!is_program_in_path("compress")) ||
             (!is_program_in_path("uncompress")))) {
                return NULL;
        }

-- 
file-roller fails to open .Z files
https://launchpad.net/bugs/26662