I found a sort-of answer here:
https://superuser.com/questions/730249/run-command-to-open-csv-file-in-excel
But it's not enough to simply use excel to open my .CSV file; I want to import the .csv data into the excel worksheet (I can do it using the wizard built into excel if I open the program manually), but I want to do this all strictly using CMD. I have previously generated a .csv file using SQLCMD but I couldn't generate it into an excel file, so I'm trying to do this all in 2 steps instead.