Windows Server 2012 and C$SYSTEM

We updated to Acu 9.2.2 on Windows Server 2012 to address the reported issue with C$SYSTEM for Windows 8 assuming our issue with Server 2012 was related to the same.  The purpose of the call is to display a pdf file with the default pdf viewer as follows:

          move spaces to ws-file-name
              into ws-file-name
           inspect ws-file-name replacing
                       trailing " " by low-value.

           call "C$SYSTEM" using ws-word-file-name, 97
                giving status-code.

This method works with XP, Win7 (32 and 64), Windows 8, and Windows Server 2008.

Any ideas on how we can resolve?