Hi David.

>I am concerned that nobody has yet come up with a clear indication of what should be done where we want to install an application that has data which is not user-specific. I would like to have my findings confirmed or disproved if anyone is interested enough to investigate this.

I asked a question related to this on the Inno Setup forum and that program's author, Jordan Russell, stated that it's best to create a subdirectory of C:\ProgramData (which can be accessed using the {commonappdata} constant in Inno) and set permissions so all users have access to that folder (using a [Dirs] directive).

Doug