Solution : https://service.sap.com/sap/support/notes/891201 (SAP Service marketplace login required)
Key words : 
open/save dialog, sap_basis support package [, response html page, html control, gecko browser, shown inplace, default application, users filesystem, default program, terms plugins
Related Notes : 
       
| 563161 | SAP GUI, SAP ITS & SAP IGS patches on Service Marketplace | 
| 335521 | ITS patch installation of kernel files | 
| 330793 | Downloading patches |