#400 GUID Mismatch

AxCrypt (306)

I have been using AxCrypt for over a year with no problems. I backed up about 50 encrypted files to a flash drive because i needed to format my computer where these files were stored.

i've kept a backup of the encrypted files for quite awhile simply for the reason of backup.

When i put the files back on my computer, ten of them do not open with this "GUID Mismatch" error. they seem like a random ten, although they are alphabetically consecutive, but not at the top or bottom of the list.

They are varied encrypted files, including .doc and .jpg.

I ran XP awhile ago, but sent the files over to Vista around a year ago and they have been able to open with Vista before this incident.

I have visited the Troubleshooting link that talks about this problem and tried updating to the Beta to no avail.

I have also tried changing the registry entry to allow AxCrpyt to attempt to open broken files, but that does not work, and the registry entry does not exist when the Beta is install, so i cannot update AND try this method.

When copying the Meta info into notepad, i paste one number (i.e. 3 or 5) and that is it.

Any help would be greatly appreciated.


  • Svante Seleborg

    Svante Seleborg - 2009-10-13


    A "GUID Mismatch" error is usually the result of one of two situations: A file that was never properly written, or a file that simply is not an AxCrypt file.

    The first case can typically occur when removing a USB-memory stick without using the "Safe Removal" function of Windows. In this case, the data is simply lost, becase the memory stick was removed before the data was ever written - it was just cached in PC, and lost when the stick was removed. It's also possible that the USB stick as such is damaged, although that is much less likely.

    The second case typically occurs when a file is renamed to the .axx-extension without actually being encrypted first. This happens when users are unsure about the workings of windows and file extensions, and tries to solve other issues by renaming.

    From your description, it sounds like the first case may be your problem. It could also have happened when you copied the files back to the computer of course, in which case you can simply try again.


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    Anonymous - 2009-10-13

    Thanks for your response svante.

    I am generally pretty good about "Safely Removing" before i actually pull the USB stick out.

    I'm not sure if it matters much, but i am running U3 on the flash drive. I use a program called CruzerSync to back up said files. I'm not sure if this could be another possible problem, or if this could possibly rule out the files not being written. Because i'm sure that i always run the program, and always close it before removing the flash drive, if i don't "Safely Remove" the program is definitely closed.

    The files have definitely not been renamed. I am pretty versed in Windows and know that this would not work. They are encrypted with AxCrypt, decrypted and opened occasionally, and never edited. Then re-encrypted.

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    Anonymous - 2009-10-13

    do i have any options at all to recover the data that is not opening?

    Last edit: Anonymous 2016-01-04
  • Svante Seleborg

    Svante Seleborg - 2009-10-14


    To be perfectly honest - I don't think so. If the data is not written to the file, there is nothing to recover. It's also not possible to recover parts of the stream, even if there is data written at the end of the file - although it's more likely that the entire file is empty. You could check that with a binary editor.

    The registry entry 'TryBroken etc' is still supported afik in the beta, but it's not by default placed there. You can manually add it, and the code should honor it. Use the same relative location as documented for, except that it's under 'Axantum' - not 'Axon Data'.


  • Nobody/Anonymous

    so i got a binary editor and tried to open the files.
    i got 2 results.

    1 was that some of the corrupt encrypted files seem to be other files that were on my flash drive, under the same back up program.
    it opened in plain text but all of the info from these others files are there.

    and 2 i got a big document that looks like this: ÿÄI£'Ù9l@z&23&&0&Š^&25&gž˜±T*­øŒˆ~b&4&àl-

    does any of that matter or help any?

  • Svante Seleborg

    Svante Seleborg - 2009-10-16


    Your results seem to indicate that the files and/or file system on your USB drive is severly damaged. It's hard to envision a situation where at least case '1' below is caused by an AxCrypt malfunction. It would seem that you should treat this as a case of a damaged device, and try whatever repair options are available to you for that.

    In all honesty, it is seldom that much can be recovered, so I'm afraid that you may be out of luck.

    At this point though, it seems that there is little that can do from an AxCrypt point-of-view to help you out. Try to find sources of information on possible reasons for damaged files in general on your type of USB stick with your type of USB software.


  • Nobody/Anonymous

    sounds good.

    thanks for all your help svante. i appreciate it.

  • Svante Seleborg

    Svante Seleborg - 2009-11-17
    • status: open --> closed

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