Solution : https://service.sap.com/sap/support/notes/515358 (SAP Service marketplace login required)
Key words :
explorer-specific registry entries correct, q140991 knowledge base articles, [hkey_local_machine\software\classes\sapfront, 00 [hkey_local_machine\software\sapfront, [hkey_local_machine\classes\sapfront, internet explorer asks, newer service packs, download files solution, sapgui patch level 20, sapfront application
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| 451232 | EP 5.0: Integration of SAP Applications & Session Mgt |