Hello Tim O,
AxCrypt encrypted files should have a file extension “.axx”. Also, default application for the file type “.axx” should be AxCrypt app only.
If the AxCrypt app is not configured as a default app for the file extension or no other apps are mapped to the file extension.
Might be, the default application is not mapped for the file extension “.axx” in your system. So please change the default application to AxCrypt for the file extension for “.axx” with the help of following links,
https://support.microsoft.com/en-us/help/4028161/windows-10-change-default-programs or https://support.microsoft.com/en-us/help/18539/windows-7-change-default-programs
Now all the encrypted files with the file extension ‘.axx’ will be opened by double clicking the file. Restart the system/AxCrypt app, if required.
If the above doesn’t help, please write an email to our support team at support@axcrypt.net.