Solution : https://service.sap.com/sap/support/notes/188469 (SAP Service marketplace login required)
Key words : 
6b windows nt r3up r3setup reason, important general information                25/feb/2004b, start importing japanese language data, importing      fcs japanese language data, japanese ga language data, \              sap r3 management console, 6b japanese                 14/jan/2000 caution, 6b japanese language disc, database/os upgrade problems  3, 6b    japanese online documentation
Related Notes : 
       
| 334117 | |
| 206078 | |
| 181096 | |
| 181091 | |
| 179713 | Installation: 4.6B R/3 installation on Windows NT (general) | 
| 179373 | Additional info for upgrade to Rel.4.6B | 
| 179136 | INST: 4.6B R/3 Installation on UNIX | 
| 42305 | RSCPINST (I18N configuration tool) |