FileMagic is known as a reliable file viewer that simplifies the task of viewing, and handling numerous file types, such as hard-to-handle and varied "dot" file types.
In case you encounter common formats such as .docx, or less common ones such as . https://www.filemagic.com/en/page-layout-files/dot-file-extension/1-solution-for-all-your-dot-file-issues/