You should follow the steps above to create a writable workbook based on an existing xls file.
ok ok
'
workbook2 have 2 sheets Rapport and Engins
Dim workbook2 As ReadableWorkbook
workbook2.Initialize(File.DirAssets ,"rapport_secu_vide.xls")
'
Dim workbook1 As WritableWorkbook
Dim feuille1 As WritableSheet
Dim feuille2 As WritableSheet
workbook1.Initialize2(File.DirRootExternal,"rapport_secu.xls",workbook2 )
the 2 lines above create or reopen the existing sheets ?
feuille1 = workbook1.AddSheet("Rapport", 0)
feuille2 = workbook1.AddSheet("Engins", 1)