Solution : https://service.sap.com/sap/support/notes/540758 (SAP Service marketplace login required)
Key words :
registry underhklm\software\microsoft\windows\current version\app paths\<exename>, app-path-registred sap gui executables, \program files\sap\frontend\controls, \program files\sap\frontend\sapgui, terms sapsetup gui patch gnnex, \program files\sap\frontend\, sap front-end patch, app-paths registrations, app paths registrations, uninstall sap gui
Related Notes :
| 642523 | RTL SAPGUI for Hebrew: Limitations and Hardware requirements |