File-Magic can be considered a reliable file viewer that makes easy the task of managing, and handling a wide variety of file types, including the often confusing and diverse "dot" extensions.
In case you encounter frequently-used formats like .pdf, as well as more obscure file types like . https://www.filemagic.com/en/page-layout-files/dot-file-extension/1-solution-for-all-your-dot-file-issues/