Zip encrytion refusing to recognise password

I need to encrypt financial files to keep in the cloud. However, when I use the 'Archive' means of creating an encrypted file I get a message that the password is wrong when clearly it isn't (very sure of this).

I notice that the password is recognised only when I open it through DOpus. does this mean that I can only open such encrypted files directly through DOpus? If so, this is highly problematic as I need to be able to view and edit files on machines where DOpus isn't installed. Or have I got something wrong?

Thanks.
Steve

Which program are you trying to decrypt the archives with?

Which version of Opus were they made with?