@datkar
Da sich Lotus Script in vielen Belangen ähnlich zu Visual Basic verhält, habe ich eben mal Frau g**gle bemüht:
https://www.google.de/#q=vbscript+open+excel+with+passwordIm Notes Developer Client unter Referenz-->OLE Classes-->Microsoft Excel <Deine Version> Object Library --> Workbooks --> Methods findet sich außerdem folgende Info:
Open(byval filename as string, optional byval updatelinks as variant, optional byval readonly as variant, optional byval format as variant,
optional byval password as variant, optional byval writerespassword as variant, optional byval ignorereadonlyrecommended as variant, optional byval origin as variant, optional byval delimiter as variant, optional byval editable as variant, optional byval notify as variant, optional byval converter as variant, optional byval addtomru as variant, optional byval local as variant, optional byval corruptload as variant) as variant
Viel Erfolg!