File-Magic can be considered a reliable file viewer that makes easy the process of viewing, and working with a wide variety of file formats, especially complex and diverse "dot" file types.
In case you encounter common file extensions such as .jpg, 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/