Mac OS 10.14.6 Mojave Vensim 8.0.7 MacBook Pro (13-inch, 2018, Four Thunderbolt 3 Ports)
Using Model>Export dataset and choosing .xlsx format produces a .xlsx file that when I attempt to open with excel [version 16.16.16 (191111)] it is labeled as corrupt and will not open. .xls format is OK.