DOS

operating system control software and hardware

some comands :

cd.. (exit)

dir (see files)

exe files each office program 

powerpoint: powerpnt.exe

power point viewer: pptview.exe

word: winword.exe

excel: excel.exe

outlook: outlook.exe

accsess: msaccess.exe

winver (windows 10)

in on the usb (D:) (F:)