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Error during opening 7z file created using Multi Commander.

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kamil_w:
I have created a 7z archive of virtual machine using Multi Commander. File has about 3GB. Archiving went well, but now, when I want to open that file using MC a window with error message appears with information "Failed to open volume. Corrupted or wrong format". I haven't got such problem with small files.

Mathias (Author):
I'm not able to reproduce that.
That error happen when MC can't open the file because the 7z engine does not recognize it or something.
There might be more info in the logwindow (Ctrl+L)
MC do not encode/decode 7z by it self it is using the 7za.dll that is provided by the creators of 7z
Maybe the archive was created with a newer version of 7z and then opened with a older version? or it maybe it was corrupted when copied between machines or AntiVirus is blocking MC from opening it. Or they are permission issue on the file and MC is not allowed to open it.



kamil_w:

--- Quote from: Mathias (Author) on November 08, 2015, 16:29:42 ---There might be more info in the logwindow (Ctrl+L)

--- End quote ---

I have tried one more time. There is no information about compressing, but there is an error which is appearing when archive is being opened.


--- Code: ---2015-11-08 20:27:21.552 ERROR : Failed to open volume : "H:\BackUP\SDPWWKVMHV1.7z" - Wolumin jest zły. Uszkodzony lub nieprawidłowy format! (Error code :41)
--- End code ---

Here is screenshot with error message:


--- Quote from: Mathias (Author) on November 08, 2015, 16:29:42 ---Maybe the archive was created with a newer version of 7z and then opened with a older version? or it maybe it was corrupted when copied between machines or AntiVirus is blocking MC from opening it. Or they are permission issue on the file and MC is not allowed to open it.

--- End quote ---


1. Archive creation and opening was made in the same session of MC, so library version must be the same. :)
2. File wasn't copied/moved.
3. Permissions are fine.

Mathias (Author):
I don't know why it does not work for you. I can pack/unpack a vm images that is over 20Gig with no issues.

As I said that error is shown if the 7zip that MC is built with can't open the archive (Or if something external is preventing it like AV or other )
Why it does not work on your machine don't know.

Are you sure the 7z archive is correct ? can the standalone 7z open and unpack it ? Maybe the issues is with packing and not unpacking ?


kamil_w:

--- Quote ---Are you sure the 7z archive is correct ?
--- End quote ---

That is the point. 7z archive created in MC is incorrect.



EDIT:
I have installed 7zip. Is there a way to compress files using standalone 7zip by pressing key combination in MC?

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