UNZIP does not work with this file

Help & Support
1

Hi,

please download the .zip file from here

http://members.chello.at/robert.graf/Bugs/DirectoryOpus/NoUnzipWithDOpus8225.zip

and try to unzip it - nothing happens - no unzip no error message.

Works brilliant with Total Commander 6.55 - tested with DOpus 8.2.2.5U.

Thanks,
Robert

2

I agree that Opus should show an error message in situations like this. It's annoying that it doesn't at the moment.

That said, I think the zip file itself is either non-standard/corrupt or uses some new part of Zip (like AES encryption or something) that not many things work with.

If I try to extract it with IZArc I get a zero byte file, and no error message.

If I try to extract if with WinRAR I get no files extracted and two error messages:

[quote="WinRAR"]! NoUnzipWithDOpus8225.zip: Unknown method in stuzza-handbuch.pdf
! NoUnzipWithDOpus8225.zip: No files to extract
[/quote]

3

I can't remember with which tool I've zipped it but I think it was a lower version of SpeedCommander 11 - btw - the unzip with SpeedCommander 11 works (http://www.speedproject.de/).

But as you can see TotalCommander 6.55 works too - I don't know what TC supports but I know I didn't do something special - maybe the default settings ...

I've just found the file and I've thought I give an example file. Please download it - I don't know how long the file will be on my server :wink:

PS: If you need the original .pdf please let me know.

4

WinZip can't extract the file either but does report some useful information:

[quote="WinZip"]Extracting to "Temp\wz17c7"
Use Path: yes Overlay Files: yes
skipping: stuzza-handbuch.pdf this file is not in the standard Zip 2.0 format.
Please see www.winzip.com/zip2.htm for more information.
Version needed value for this file is 51.
Compression method value is 12.
error: no files were found - nothing to do[/quote]

I looked up compression method 12:

[quote="Wikipedia"]Bzip2 (method 12)
This method uses the well-known bzip2 algorithm. This algorithm performs better than deflate but is not widely supported, particularly by Windows-based tools.[/quote]

Seems silly that there are programs out there using that compression method. :frowning: The good thing about Zip is that everyone can unpack it but that's lost when using a method that almost no Windows programs/libraries support. Might as well use a better compression system if compatibility isn't the aim.

Whether Opus can support this compression method probably depends on the company who make the Zip library Opus licences.

5

[quote="nudel"]
Seems silly that there are programs out there using that compression method. :frowning: The good thing about Zip is that everyone can unpack it but that's lost when using a method that almost no Windows programs/libraries support. Might as well use a better compression system if compatibility isn't the aim.[/quote]

It's even more silly that they name the file ".zip" when it's a ".bz2", isn't it? It's like "lets make a better version of gif, lets use the same internal format as png instead, but we'll still call the files .gif so nobody will notice the difference!" :slight_smile:

6

Don't give away the secret about my 32bit transparent lossless jpeg images! Ack! Now I need to create a new format... 32bit transparent lossless animated jpegs!