Oops.  $password should be $backup_pass in that example.  I did test it
and it otherwise works as far as I can tell.  Hope that helps.

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https://bugs.launchpad.net/bugs/220654

Title:
  file-roller will not open 256 AES zip files

Status in “file-roller” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: file-roller

  Winzip and many other zip programs can now produce zip files that are
  protected by 256 AES encryption.  FIle-roller in ubuntu cannot handle
  these zips.  The files within the zips are shown fine but when you try
  and extract the following error occurs:

  skipping: Test.txt                unsupported compression method 99

  I believe this is because "unzip" is used to extract the archive.  This is 
the output from "unzip":
  dbrewer@HCC122J:~/Desktop$ unzip Test.zip 
  Archive:  Test.zip
     skipping: Test.txt                unsupported compression method 99

  
  If "7z" is used it works fine:
  dbrewer@HCC122J:~/Desktop$ 7z x Test.zip 

  7-Zip 4.51 beta  Copyright (c) 1999-2007 Igor Pavlov  2007-07-25
  p7zip Version 4.51 (locale=en_GB.UTF-8,Utf16=on,HugeFiles=on,2 CPUs)

  Processing archive: Test.zip

  Extracting  Test.txt
  Enter password (will not be echoed) :

  Everything is Ok

  So I propose that file-roller uses "7z" instead of "unzip".

  I attach an example of this kind of file.  The password is "monkey"
  (no quotes).

  Note peazip also can handle this.  Maybe a replacement for file-
  roller?

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