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Do you want tshark to write the dissection to "SYNscan.txt"? If so, then you'll have to redirect the output, e.g.

C:\Windows\system32>"c:\Program Files\Wireshark\tshark" -x -n > SYNscan.txt

Any final argument supplied to tshark without an argument prefix is treated as a capture filter.

Note also that you won't be able to write to the current directory (C:\Windows\System32) unless you're running with elevated privileges, and you shouldn't be running tshark with elevated privileges.