I am attempting to synch model elements to an .xlsx file. When I specify and read the file into Cameo the mapping options are grayed out, and none of the table columns show up on either side of the mapping window. CSV works fine, but I cannot get the .xlsx file type to work. The excel table is simple text and integer values with the first row as the column header. 

I've tried this with 22x and 24x. Both work the same. It is my understanding that the excel plugins are built-in?

Any help is appreciated.

-Ray