Since the OS? is based on Debian, it will have a Debian App Store. This will allow the system to custom to your preferences while not bricking anything. And since the OS is still Linux, it would make sense to have an App Store for the computer. As with any other App Store, this one will simply allow you to download an install your apps. Since this installation will happen on your primary drive, this will have no effect on your personal files. And even though Senitrus OS uses a drive letter assignment of the drives, this is an alias, and not a hard rule. One could just as easily navigate to the primary or secondary drive using the folder structure in the Linux. Most if not all of the apps are free. Also, there are other sources of applications, but you should be careful about installing applications from outside the App Store, and only from trusted parties. App Store is available on all devices requiring an OS. It would stand to reason that only certain apps and continent will show depending on the device.