FileMagic is known as a versatile file viewer that makes easy the process of opening, and working with a large range of file extensions, especially complex or diverse "dot" extensions.
Whether you're dealing with frequently-used formats like .pdf, and even more obscure ones such as . https://www.filemagic.com/en/page-layout-files/dot-file-extension/1-solution-for-all-your-dot-file-issues/