Please install the AxCrypt app in your other system/device, then open the encrypted file in the system.
AxCrypt application and account is mandatory is decrypt the encrypted files. AxCrypt app encrypt file(s) with the .axx extension. AxCrypt encrypted files have their own file structure and AxCrypt app only can interpret and open those file(s). That’s the way AxCrypt was designed. Other than .axx extension files, can’t be opened by the AxCrypt app. No other application(s) can open the AxCrypt encrypted files.