combining UAR files from different versions

Author: (ulrich-merkel)

assume we have some 3rd party additions (written in 9.3 and deployed as UAR); but our supplier is no longer available.

Now we upgrade our application to 9.4 (or 9.5) which accesses these 3rd party components.

Question (because I have not found any hint in the documents I scanned):

Is it possible to use the "old" resources together with the 9.4+ application

Will there be some documented behaviour on multi-verion resources to be on the safe side for the future

TIA, Uli


  1. You can run 9.3 compiled code from 9.4 uniface.exe (We are doing this at the moment.) I wouldn't know about future proofing...

    Author: Iain Sharp (
  2. Hi,

    be carefull with mixing up. As far as I note, there is some kind of down-compatibility.

    But if you use 9.3 uars with 9.4 it causes crashes ;)

    Best regards


    Author: Thomas.Young (