Solution : https://service.sap.com/sap/support/notes/675939 (SAP Service marketplace login required)
Key words : 
\\<cihost>\sapmnt\<sid>\sys\exe\<charset>\<platform>, documentation 'installation guide - sap web application server abap, \\<cihost>\sapmnt\<sid>\sys\exe\runso, ======================================================================= contents 1    general 2    pre-installation 3    installation 4    post-installation note, set startup parameter -g512to avoid errors, database instance installation20/jan/05   3     setup failed, symptom sap web application server 6, arithmetic overflow error converting expression, set startup parameter -g51224/jul/03   3, igs dvd stated twicein section
Related Notes : 
       
| 723288 | Central Installation Note SAP Web AS 6.40 SR1 |