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"Can not open file as archive" ***.7z

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2013-05-03
2013-06-28
  • junior.fanchini

    junior.fanchini - 2013-05-03

    Goodnight everyone, I would like some help from you, I am unzipping a backup file of my company but with the following error "Can not open file as archive junior.7z", already tried unsuccessfully several fireplaces.

    first 32 bytes:37 7A BC AF 27 1C 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

    last 96 bytes:0C 0C 80 41 2A BD 58 FB 4D E1 00 2C 09 D0 1D 55 91 BD 1D 1F 1A 1E AF 7E 33 22 66 82 08 5E A8 18 3B D1 16 26 79 E8 C9 B7 11 B7 52 E9 C6 B9 12 B7 E3 81 EB 55 B2 5B 98 A9 34 FD 3C 22 A5 E6 3B 0F 83 C0 B5 A8 84 D4 00 2F 8A 38 CD 5E 59 D5 C2 5C B7 AD 39 37 D7 CA BE 86 1C F8 2C 94 1C 09 EC 63

    I'm posting this information because I saw several people with the same problem, or like, posted.

    thank you

     
  • junior.fanchini

    junior.fanchini - 2013-05-04

    Igor, Good afternoon, I'm going to do this procedure, but a doubt. The file size of this disk "60.1 GB (64,585,441,744 bytes)" when I click on file properties. But the window shows 63,071,721 kb.
    Is that correct?

    Thank you.

     
  • Igor Pavlov

    Igor Pavlov - 2013-05-05

    Yes, probably it's correct.

    1) what the number of files in archive and file types.
    2) show first 48 bytes in hex:

     
  • junior.fanchini

    junior.fanchini - 2013-05-05

    Come on, I'm running the first procedure you gave me.

    the 1st 48 bytes: 37 7A BC AF 27 1C 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 28 12 BC 60 28 0F 97 D1 CC 94 7F 22 F4 AC CF

    File types, varied. and large quantities.

     
  • Jānis Zalāns

    Jānis Zalāns - 2013-06-28

    6 bytes 37 7A BC AF 27 1C Archive signature OK
    1 byte 00 Major version 0 - OK
    1 byte 02 Minor version 2 - OK (seems that You used old 7zip version)

    the next 24 bytes is empty (zeroes). they should've contain start header CRC, next header offset, next header size and next header CRC. So, start header CRC has invalid value, and there is no information about where end header starts and how big it is. Probably You compressed multi volume archive and started to copy volumes before compressing process was ower. 7zip writes these values at the end of job.

    You can try to fix the header (assuming file size You gave is correct), by changing first 32 bytes. But i don't see archive end header in last 96 bytes You provided. Look for byte 01 starting from end. Next byte should be 02 or 04 (maybe some other, not sure). I haven't fully figured out end headers yet... :) If You find archive end header, maybe i can assist You further ;)

     

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