Unlocking my safe fails with message "Can't open file" after upgrading to version 10.3

If the name of your safe contains non-English characters, unlocking your safe can fail with the error message "Can't open file" if you are using version 10.3 of pwSafe.

The root cause of the issue has been found and fixed. To resolve the issue please update to the latest available release:

iOS: version 10.3.4 of pwSafe. Update here.
macOS: version 10.3.5 of pwSafe. Update here.