Thanks for your friendly words!
InstallShield_Cabinet_File_Viewer is not working on Win7, "missing mscomctl.ocx",
http://www.ocxdump.com/download-ocx-.../download.html into the same directory does not help. Registering the ocx with regsvr32 not possible.
So the process fails at that point here.
EDIT: I solved the cabfileviewer part by using an XP virtual machine which I often use. Now I have a non Steam sh5.exe which I will backup a thousand times

. And will go on with the process...