Open Multiple Files in Excel

I'm trying to generate a list of multiple files to open through VBA in Excel '98 on a Mac, but can't seem to get it to work. Am using the following:

DataFiles = Application.GetOpenFilename(MultiSelect:=xlSimple)

According to the documentation, MultiSelect should be either true or false, but neither of those generate errors. The above code is accepted, but I still can't Shift-click, Command-click, or Ctrl-click to select multiple files. Any suggestions???

I'm having similar problems with the "multiselect" option of "getopenfilename" with Excel v.X on my Mac running OS 10.2.6.

Since the previous post hasn't got any responses in more than 2 years, I suspect that this may not be the best place to post this problem.