Endless OS is a Linux-based operating system, which means that it does not have direct support for apps built for other platforms such as Microsoft Windows. However, Endless OS does include an apps ecosystem which provides suitable replacments for many common apps.
If you have a favourite app from another platform that is not available on Endless, feel free to reach out on our Community Forums for suggestions as to which app may be a suitable alternative.
These alternative office suites provide a decent level of compatibility with Microsoft Office file formats such as DOC/DOCX. However, some of the more advanced features may not be completely preserved, so before you edit your Microsoft Office files with your Endless computer, be sure to create a backup of the originals.
If you have an inflexible requirement to run a specific Windows app, you could explore running Windows within Endless OS virtualised in Boxes (available in the App Center), or by dual-Booting Windows and Endless.