WinKeyDOS

WinKeyDOS is a command-line utility that quickly retrieves your Windows serial number, in case you have lost or forgotten it, and saves it to a plain text document automatically. It can be handled with ease by all types of users, even those less experienced with console applications.

There is no command-line parameter implemented for getting the Windows serial number, so all you have to do is call WinKeyDOS's process from a Command Prompt window, as this will automatically trigger the key collection. It saves it to a plain text document saved in the same location as the .exe, which you can access to view the license key.

Although most people are used to graphical interfaces, some of them prefer command-line programs, since a few lines typed in the window are typically enough to carry out a task rapidly.

The tool doesn't require installation and it's wrapped in a single .exe file which can be saved anywhere on the disk or on a USB flash drive, in order to seamlessly launch it on any computer without previous setup. Moreover, it doesn't add new entries to the Windows registry, need DLLs to run, or create extra files on the disk without your permission.

Unsurprisingly, it didn't put a strain on the computer's performance, running on a low amount of CPU and RAM. No error dialogs popped up and it didn't hang or crash.

On the other hand, we have noticed that it has compatibility issues with newer Windows editions. However, we are also taking into account that the program hasn't been updated for a long time, so this should be expected. Nevertheless, you can test WinKeyDOS for yourself, since it's free.