The error message indicates that the file simply is not an AxCrypt file – it checks the first 16 bytes for a unique value.
Most often, this error occurs because the file is not produced by AxCrypt, but rather a different kind of file accidentally renamed to end with .axx. Another scenario is that it is a left-over after a previous decryption was interrupted at the stage where the original is overwritten.
Another scenario is that it is a left-over after a previous decryption was interrupted at the stage where the original is overwritten. The most common reason for this happening is that the file was damaged because of early removal of a USB drive, or a disconnected network drive.
If the file is actually damaged to this extent, no, it can’t be fixed. The data is just not there to decrypt it.
If the file was recovered from any recovery software then please check the file structure to make sure that the file was not corrupted by using the AxCrypt menu option(Debug |Check file). You can see all OK in the check file summary, if the file is valid.
If the file was damaged, then try to use the Try Broken File feature. Yes, We have a feature called Try Broken File. With that, we are able to decrypt the corrupted AxCrypt encrypted files by navigating the menu File | Options | enable Debug from the AxCrypt app.
Now you are able to see the Debug the menu in the AxCrypt app. From the debug menu you have to click Try Broken File.
Now you will be prompted for file selection. Select the corrupted encrypted file and then AxCrypt will try to decrypt the file. If successfully decrypted, then you are able to see the decrypted file in the location. Otherwise sorry to say, AxCrypt can’t decrypt that file.