I also assumed the functional process between the CLI and Sync are the same. And note that these file formats are not amongst the supported types listed on ACD and repeatedly when I had previously tried to access these files, upon downloading them either through the Sync function via odrive or directly from ACD webapp, I was unable to open them. But voila! Now I can.
I had uploaded prior .dmg installers for my tax software archive that I presumed were long gone. Every one of these files and disc .iso files I downloaded with CLI now mounts!
Still, I'm curious as to why?