Solution : https://service.sap.com/sap/support/notes/496977 (SAP Service marketplace login required)
Key words : 
bw front-end patch includes procedure downloading bw front-end patches, directory   sapservx/general/frontend/patches/rel610/windows/win32the file, /swcenter-mainthe sap download area appears, ftp downloading bw front-end patches, 0a/binary patches/sap gui windows, bw front-end check tool sapbexc, installing bw front-end patches distributing, downloading bw front-end patches, \program files\common files\sap\system, download bw front-end patches
Related Notes : 
       
| 533990 | BEx Analyzer: Unable to execute query in customer namespace | 
| 526438 | Internal error with communication with the IGS | 
| 496976 | BW 3.0A front-end patch 7 | 
| 396452 | Server-based BW Frontend check | 
| 361222 | SapPatch: Importing GUI Patches | 
| 197460 | BW Frontend Checktool sapbexc.xla | 
| 142705 | Files for the BW support | 
| 96885 | Downloading front end patches |