Solution : https://service.sap.com/sap/support/notes/605649 (SAP Service marketplace login required)
Key words : 
change history date            topic           short description------------------------------------------------------------------------mar/01/2006   var, sapcar '-xvf /qopt/<volid>/data/wfmc100i, sap work-force management core, sapcar -xvf /<cd_dir>/data/wfmc100i, latest spam/saint update, sap web application server 6, sapcar -xvf <cd_drive>, required component support packages, sar archive wfmc100i, spam/saint update
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