Run free Windows online emulators using your web browser. This extension provides the ReactOS system and a Win10 online theme over a Ubuntu that run in the "OnWorks" free servers hosting provider. This extension is a good way to be working in a similar to Windows desktop:
1. ReactOS is a free and open-source, Windows-compatible OS that looks similar to Windows XP. It looks like Windows NT and aims to offer similar levels of functionality and application compatibility. This operating system already runs a selection of software written for Windows XP and Windows Server 2003, and the latest 0.4.8 release lays the groundwork to run Vista, Windows 8 and Windows 10 apps. It is in a bit experimental state but it must be noted that this system does not use any of the Unix architecture, it is a rewrite of the NT architecture, it uses a FAT32 implementation, and it is completely free of legal implications.
The most important app inside ReactOS is the "applications manager" to find open source applications that are known to work well.
2. The free Windows 10 online theme is Windows-style desktop environment over an Ubuntu OS online. It is not a perfect imitation of Windows but it is a try about how to create a look and functions more like Windows. This is possible because the GNOME Shell desktop supports extensions, which can change the layout of the desktop and add various other features.
Note that all of these OS are integrated with the file manager that are provided by the OnWorks free hosting provider. This file manager can be used to save and load the files handled inside the OnWorks online workstations.