I'm developing a cross-platform macro that needs to open several files
at once.

In Windows, I can use GetOpenFileName with the multi-select option to
get a list of chosen files in a single dialog:

ChosenFiles = Application.GetOpenFilename("XLS Files (*.xls),
*.xls", 1, "Please select XLS data files to import", , True)

On the Mac, I don't seem to be able to pass any of the parameters.
Can Macs even do multi-select?

ChosenFiles = Application.GetOpenFilename("")

Thanks!

John