Some customers complained that sine the upgrade to SAPGUI 710 patch 13. The error message 26172 is raised if you try to display originals in the DMS transactions.
We found out that unfortunatly the file "SAPHTTP.EXE " is corrupt in SAP GUI patch level 13 and therefore this error message is raised.
At the moment the solution is to download the lastest available binary files for sapftp.exe and saphttp.exe as explained in the following SAP notes.
Please copy the files in the sapgui folder of your client to avoid this bug in your system. Our development department already know about this issue and is working on a solution.