Solution : https://service.sap.com/sap/support/notes/188139 (SAP Service marketplace login required)
Key words : 
6b windows nt unix r3up r3setup reason, important general information                25/feb/2004b, start importing thai language data, 6b thai thai country version, 6b thai              07/jan/2000c, 6b thai                    07/jan/2000 caution, 6b thai language disc, /globalization -> country information         -> thailand, database/os upgrade problems  3, important general information   1
Related Notes : 
       
| 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 | 
| 45463 | Thai installation procedure | 
| 42305 | RSCPINST (I18N configuration tool) |