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I haven't done this myself, but perhaps these links could provide some assistance.
You will need to do some scripting to loop though your csv files one at a time and execute the TABCMD command for each iteration.
Or perhaps create one CSV using Powershell (Some other scripting language), and then execute the TABCMD command.
Hope this helps.
from msdos prompt
> copy *.csv 1.csv
then use Tableau to create / update extract
Thank you Cristian - I found this last night as well and it worked like a charm.