How access the files from a Samsung S3 with DOS commands?

How access the files from a Samsung S3 with DOS commands?

After enabling the "Developer options" in the Settings of a Samsung Galaxy
GT-I8190N, and connecting it to the PC via the USB cable I was able to
backup its files using the file explorer from Windows XP Professionnal.
I'm trying doing the same in DOS, in order to preserve timestamps.
I plan using this DOS command: XCOPY source destination /H /R /K /O
However, the phone is not listed together with a drive letter, but as
"Computer" (Poste de travail) and I cannot figure out how to navigate to
it with DOS commands.
Using the "Computer management" tools, I could see that the smartphone is
not listed as a drive but as a "Portable device".
Any way to access such device in DOS ?
(I encounter similar problem to access the files using Linux. fdisk
doesn't list the phone sd card as a drive, but the phone is listed by
lsusb.)
Thanks for your help.