[Data]

I could but I don't see that command.

I do see the
"First line tells DOSBox to mount C:\DOSBox\CDrive as C drive. In other words, when you start DOSBox, your C drive hard disk"

and the
"When new windows opens, find and select our DOS folder. Destination folder should say "C:\DOSBox\DOSBox-0.63" for DOSBox version 0.63. Click install."