You mean to add password on it to make it only readable and not changeable?
I do not understant the requirement ‘not downloadable’. Why are you downoad then an excel file?
Please try to specify what do you mean with ‘not changeable’. After the file is downloaded as Excel, its outside of the range of your app to control changes. Do you mean adding a password to make it not changeable or is there an another way that I am not aware by now?
not-editable (changeable) and not downloadable
I saw your answer about changing it in sharepoint, you know it already.
Default mendix out of box it is not possible. Probably if you know how to write java actions, check if it is possible to lock the excel with third party API’s.